[AC Question]

my htc m8 used to stack where touch screen does not function and after one to two minutes it turns off and restart itself.

[B. Diddy]

Welcome to Android Central! It could be some app you installed that is causing instability. First, try booting into Recovery and wiping the cache partition, which won't erase any personal data: http://forums.androidcentral.com/htc...tc-one-m8.html. If that doesn't help, then try booting into Safe Mode, which prevents all 3rd party apps from starting. If the problem goes away in Safe Mode, then you know that something you installed is the culprit--the challenge then is to figure out which app. You may have to uninstall apps one by one. If, on the other hand, the problem remains in Safe Mode, then the issue lies with either the hardware or the system. https://support.t-mobile.com/docs/DOC-10853