the app crash frequently
The app crash all time with navigation on interet, facebook app, games. multithreat isn't optimized
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Regarding the issue, it’s not the app crashing but Android killing it to free some resources.
My guess is that you’re using a Moto G device or a device running Android 5.x
Both have a major bug which makes Android kill background apps way too often. If you’re on Android 5 the workaround is to reboot the device on a daily basis until Google releases the fix.
Sorry I cannot be more helpful