why does my 640 xl randomly shuts down?

[shivanieds]

Everyday, my phone shuts done spontaneously at least 2 times. Why? My phone is usually clog free.

 

[erfanjafar]

Are you using 8.1 or Windows 10 mobile? If you are on TP then I suggest you roll back. Other options are a soft reset and if that doesnt work try a hard reset.