Sometimes when using WhatsApp, WeChat, I'll be typing a message to someone and suddenly the phone will freeze for a good 5-10 seconds before restarting itself. Whenever a crash like this happens, it will automatically restart. Same with using any random app, sometimes even viewing Album or using the camera.
It will automatically restart even when idling. I tried update to the Official 14.4.A.0.108 Firmware but the problem still exists. Is this clearly software or phone issue? Please help.