diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 5c90b62ab..32e8f0db0 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -135,6 +135,8 @@
             </intent-filter>
         </receiver>
 
+        <receiver android:name=".receivers.GoogleSyncReceiver"/>
+
         <provider
             android:name="android.support.v4.content.FileProvider"
             android:authorities="com.simplemobiletools.calendar.fileprovider"
diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/activities/MainActivity.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/activities/MainActivity.kt
index 71209c37a..3a95a2e45 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calendar/activities/MainActivity.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/activities/MainActivity.kt
@@ -91,8 +91,9 @@ class MainActivity : SimpleActivity(), NavigationListener {
         }
 
         if (isGoogleSyncActive()) {
-            FetchGoogleEventsTask(this, googleSyncListener).execute()
+            FetchGoogleEventsTask(applicationContext, googleSyncListener).execute()
         }
+        scheduleGoogleSync(isGoogleSyncActive())
     }
 
     override fun onResume() {
diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/activities/SettingsActivity.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/activities/SettingsActivity.kt
index 44be05bc0..f6da50ac2 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calendar/activities/SettingsActivity.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/activities/SettingsActivity.kt
@@ -14,6 +14,7 @@ import android.support.v4.app.ActivityCompat
 import com.google.android.gms.common.ConnectionResult
 import com.google.android.gms.common.GoogleApiAvailability
 import com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential
+import com.google.api.client.googleapis.extensions.android.gms.auth.UserRecoverableAuthIOException
 import com.google.api.client.util.ExponentialBackOff
 import com.google.api.services.calendar.CalendarScopes
 import com.simplemobiletools.calendar.R
@@ -48,6 +49,7 @@ class SettingsActivity : SimpleActivity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_settings)
         res = resources
+        setupGoogleSync()
     }
 
     override fun onResume() {
@@ -58,7 +60,6 @@ class SettingsActivity : SimpleActivity() {
         setupHourFormat()
         setupSundayFirst()
         setupWeekNumbers()
-        setupGoogleSync()
         setupWeeklyStart()
         setupWeeklyEnd()
         setupVibrate()
@@ -130,7 +131,6 @@ class SettingsActivity : SimpleActivity() {
 
     private fun toggleGoogleSync() {
         settings_google_sync.toggle()
-        config.googleSync = settings_google_sync.isChecked
 
         if (settings_google_sync.isChecked) {
             tryEnablingSync()
@@ -331,7 +331,9 @@ class SettingsActivity : SimpleActivity() {
         } else if (config.syncAccountName.isEmpty()) {
             showAccountChooser()
         } else {
-            FetchGoogleEventsTask(this).execute()
+            Thread({
+                fetchEventsIfHasPermissions()
+            }).start()
         }
     }
 
@@ -349,6 +351,23 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
+    private fun fetchEventsIfHasPermissions() {
+        try {
+            getGoogleSyncService().colors().get().execute() // just checking if we have the permission for fetching user data
+            config.googleSync = true
+            runOnUiThread {
+                settings_google_sync.isChecked = true
+            }
+            FetchGoogleEventsTask(applicationContext).execute()
+        } catch (e: Exception) {
+            if (e is UserRecoverableAuthIOException) {
+                startActivityForResult(e.intent, REQUEST_AUTHORIZATION)
+            } else {
+                toast(R.string.unknown_error_occurred)
+            }
+        }
+    }
+
     private fun disableGoogleSync() {
         settings_google_sync.isChecked = false
         config.googleSync = false
diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/asynctasks/FetchGoogleEventsTask.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/asynctasks/FetchGoogleEventsTask.kt
index 2e87f4a1e..d0ac6704a 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calendar/asynctasks/FetchGoogleEventsTask.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/asynctasks/FetchGoogleEventsTask.kt
@@ -1,18 +1,13 @@
 package com.simplemobiletools.calendar.asynctasks
 
-import android.app.Activity
+import android.content.Context
 import android.graphics.Color
 import android.os.AsyncTask
 import android.util.SparseIntArray
-import com.google.api.client.googleapis.extensions.android.gms.auth.UserRecoverableAuthIOException
 import com.google.gson.Gson
 import com.google.gson.JsonObject
 import com.google.gson.reflect.TypeToken
-import com.simplemobiletools.calendar.activities.SettingsActivity
-import com.simplemobiletools.calendar.extensions.config
-import com.simplemobiletools.calendar.extensions.dbHelper
-import com.simplemobiletools.calendar.extensions.getGoogleSyncService
-import com.simplemobiletools.calendar.extensions.seconds
+import com.simplemobiletools.calendar.extensions.*
 import com.simplemobiletools.calendar.helpers.*
 import com.simplemobiletools.calendar.interfaces.GoogleSyncListener
 import com.simplemobiletools.calendar.models.*
@@ -20,23 +15,24 @@ import org.joda.time.DateTime
 import java.util.*
 
 // more info about event fields at https://developers.google.com/google-apps/calendar/v3/reference/events/insert
-class FetchGoogleEventsTask(val activity: Activity, val googleSyncListener: GoogleSyncListener? = null) : AsyncTask<Void, Void, String>() {
+class FetchGoogleEventsTask(val context: Context, val googleSyncListener: GoogleSyncListener? = null) : AsyncTask<Void, Void, String>() {
     private val ITEMS = "items"
     private val OVERRIDES = "overrides"
     private val NEXT_PAGE_TOKEN = "nextPageToken"
 
-    private var lastError: Exception? = null
-    private var dbHelper = activity.dbHelper
+    private var dbHelper = context.dbHelper
     private var eventTypes = ArrayList<EventType>()
     private var eventColors = SparseIntArray()
-    private var service = activity.getGoogleSyncService()
+    private var service = context.getGoogleSyncService()
 
     override fun doInBackground(vararg params: Void): String {
+        if (!context.isGoogleSyncActive())
+            return ""
+
         try {
             getColors()
             getDataFromApi()
         } catch (e: Exception) {
-            lastError = e
             cancel(true)
         }
         googleSyncListener?.syncCompleted()
@@ -53,6 +49,7 @@ class FetchGoogleEventsTask(val activity: Activity, val googleSyncListener: Goog
     private fun getDataFromApi() {
         var currToken = ""
         while (true) {
+            service.colors().get().execute()
             val events = service.events().list(PRIMARY)
                     .setPageToken(currToken)
                     .execute()
@@ -78,7 +75,7 @@ class FetchGoogleEventsTask(val activity: Activity, val googleSyncListener: Goog
         val remoteImportIds = ArrayList<String>()
         var updateEvent = false
         var eventId = 0
-        val importIDs = activity.dbHelper.getImportIds()
+        val importIDs = context.dbHelper.getImportIds()
         val token = object : TypeToken<List<GoogleEvent>>() {}.type
         val googleEvents = Gson().fromJson<ArrayList<GoogleEvent>>(json, token) ?: ArrayList<GoogleEvent>(8)
         for (googleEvent in googleEvents) {
@@ -152,7 +149,7 @@ class FetchGoogleEventsTask(val activity: Activity, val googleSyncListener: Goog
         }
 
         if (eventTypeId == -1) {
-            val newColor = if (eventColors[colorId] != 0) eventColors[colorId] else activity.config.primaryColor
+            val newColor = if (eventColors[colorId] != 0) eventColors[colorId] else context.config.primaryColor
             val newEventType = EventType(0, eventType, newColor)
             eventTypeId = dbHelper.insertEventType(newEventType)
             eventTypes.add(newEventType)
@@ -182,12 +179,4 @@ class FetchGoogleEventsTask(val activity: Activity, val googleSyncListener: Goog
         }
         return reminderMinutes
     }
-
-    override fun onCancelled() {
-        if (lastError != null) {
-            if (lastError is UserRecoverableAuthIOException) {
-                activity.startActivityForResult((lastError as UserRecoverableAuthIOException).intent, SettingsActivity.REQUEST_AUTHORIZATION)
-            }
-        }
-    }
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/extensions/Context.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/extensions/Context.kt
index a5150f7f8..fc620dc0d 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calendar/extensions/Context.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/extensions/Context.kt
@@ -24,6 +24,7 @@ import com.simplemobiletools.calendar.activities.EventActivity
 import com.simplemobiletools.calendar.helpers.*
 import com.simplemobiletools.calendar.helpers.Formatter
 import com.simplemobiletools.calendar.models.Event
+import com.simplemobiletools.calendar.receivers.GoogleSyncReceiver
 import com.simplemobiletools.calendar.receivers.NotificationReceiver
 import com.simplemobiletools.calendar.services.SnoozeService
 import com.simplemobiletools.commons.extensions.getContrastColor
@@ -245,6 +246,19 @@ fun Context.isOnline(): Boolean {
     return connectivityManager.activeNetworkInfo != null
 }
 
+fun Context.scheduleGoogleSync(activate: Boolean) {
+    val syncIntent = Intent(this, GoogleSyncReceiver::class.java)
+    val pendingIntent = PendingIntent.getBroadcast(this, 0, syncIntent, PendingIntent.FLAG_CANCEL_CURRENT)
+    val alarm = getSystemService(Context.ALARM_SERVICE) as AlarmManager
+
+    if (activate) {
+        val syncCheckInterval = 4 * AlarmManager.INTERVAL_HOUR
+        alarm.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + syncCheckInterval, syncCheckInterval, pendingIntent)
+    } else {
+        alarm.cancel(pendingIntent)
+    }
+}
+
 fun Context.getNewEventTimestampFromCode(dayCode: String) = Formatter.getLocalDateTimeFromCode(dayCode).withTime(13, 0, 0, 0).seconds()
 
 fun Context.getCurrentOffset() = SimpleDateFormat("Z", Locale.getDefault()).format(Date())
diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Config.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Config.kt
index fcbf38af8..3eed674f0 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Config.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Config.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import android.media.RingtoneManager
 import android.text.format.DateFormat
 import com.simplemobiletools.calendar.R
+import com.simplemobiletools.calendar.extensions.scheduleGoogleSync
 import com.simplemobiletools.commons.helpers.BaseConfig
 import java.util.*
 
@@ -72,7 +73,10 @@ class Config(context: Context) : BaseConfig(context) {
 
     var googleSync: Boolean
         get() = prefs.getBoolean(GOOGLE_SYNC, false)
-        set(googleSync) = prefs.edit().putBoolean(GOOGLE_SYNC, googleSync).apply()
+        set(googleSync) {
+            context.scheduleGoogleSync(googleSync)
+            prefs.edit().putBoolean(GOOGLE_SYNC, googleSync).apply()
+        }
 
     var syncAccountName: String
         get() = prefs.getString(SYNC_ACCOUNT_NAME, "")
diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/receivers/BootCompletedReceiver.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/receivers/BootCompletedReceiver.kt
index 5abf5bed2..18c3dfb82 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calendar/receivers/BootCompletedReceiver.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/receivers/BootCompletedReceiver.kt
@@ -3,13 +3,18 @@ package com.simplemobiletools.calendar.receivers
 import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
+import com.simplemobiletools.calendar.extensions.isGoogleSyncActive
 import com.simplemobiletools.calendar.extensions.notifyRunningEvents
 import com.simplemobiletools.calendar.extensions.scheduleAllEvents
+import com.simplemobiletools.calendar.extensions.scheduleGoogleSync
 
 class BootCompletedReceiver : BroadcastReceiver() {
 
     override fun onReceive(context: Context, arg1: Intent) {
-        context.scheduleAllEvents()
-        context.notifyRunningEvents()
+        context.apply {
+            scheduleAllEvents()
+            notifyRunningEvents()
+            scheduleGoogleSync(isGoogleSyncActive())
+        }
     }
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/receivers/GoogleSyncReceiver.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/receivers/GoogleSyncReceiver.kt
new file mode 100644
index 000000000..d6b20350e
--- /dev/null
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/receivers/GoogleSyncReceiver.kt
@@ -0,0 +1,13 @@
+package com.simplemobiletools.calendar.receivers
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import com.simplemobiletools.calendar.asynctasks.FetchGoogleEventsTask
+
+class GoogleSyncReceiver : BroadcastReceiver() {
+
+    override fun onReceive(context: Context, arg1: Intent) {
+        FetchGoogleEventsTask(context).execute()
+    }
+}