Why when phone rings the swipe screen doesn't appear and why does it reboot itself periodically?

[AC Question]

I have a Galaxy S3 and it will reboot itself periodically. Also I'll receive a call and the swipe screen doesn't appear and if I'm lucky to actually log in and get to phone before it stops ringing I have no way to answer the call.

 

[B. Diddy]

Welcome to Android Central! When you say swipe screen, do you mean the phone answer screen?

It's worth doing a cache partition wipe, which won't erase any personal data: http://forums.androidcentral.com/sa...ing-into-recovery-mode-galaxy-s2-s3-tab2.html

 

[metomax]

might be a call manager app as it was in my case. if a factory reset doesnt help then consider flashing stock ROM