Why is my Lenovo a328 shutting down without any reason?

[Ms Invisible]

Ive tried to factory reset it and ive done it more than 3 times already and still nothing happend. Everytime i use my phone and i try to delete or open a file my phone shuts down even if i am not touching or pressing the off button.

Lenovo Launcher has stopped

everything in my phone has stopped except for my gallery,messaging, and my contacts.

 

[B. Diddy]

Welcome to Android Central! Does the factory reset successfully complete?

Try booting into Safe Mode, which temporarily disables all 3rd party apps. On most Android devices, while powered on, press and hold Power until the Power Off menu appears. Press and hold the Power Off selection until the Safe Mode prompt appears. Tap OK.

If the problem disappears in Safe Mode, then something you installed is causing the problem. You may have to uninstall apps one by one until the problem disappears. If the problem persists in Safe Mode, then it's more likely to be a hardware or firmware problem.