mobile

I have a rooted E7 with TWRP 2.5.6.0. The problem which I am facing is, that the phone randomly reboots. After this, something weird happens with the phone. The storage show that the files are present on memory, but the images aren't visible in gallery. Also if I try to take a screenshot, it gives some error. After manually rebooting the phone, everything starts working normally.

So, is anyone else facing the same issue??

Any solution for this random reboot issue?
Any help will be appreciated.
Thanks