iPad randomly restarts every few minutes

Starting from a few days ago, my iPad mini(1st gen) was restarting every 3-5 minutes. I tried to normally restore, then recovery mode restore, and today DFU restore mode. None of these methods worked. My warranty is already expired, so I cannot bring it into an Apple store. How do I fix this problem? EDIT: I jailbroke my iPad today, hoping to find a solution to the problem in Cydia. When I was downloading a tweak, the "restart springboard" after downloading would restart my device. Could there be a problem with springboard? EDIT 2: I realized that it would have a period of time that it wouldn't autorestart(usually 2-3 hours), then restart approx every 30secs-2mins.