I have Samsung Galaxy Tab 2 running on Android 4.1.2 Jelly Bean. It had a problem with restarting by itself. As it restarted too many times at a stretch, it did a factory reset on its own. It did not delete any music or image file, but all the apps got uninstalled.
I successfully reinstalled all apps, except WhatsApp. WhatsApp was getting downloaded but it was not getting installed. I don't know why. I tried downloading it from Play Store and an app called Mobogenie. I even tried using ShareIt. The app is still not getting installed.
How to fix this and reinstall WhatsApp?