Applications are getting closed randomly after some fixed time

[AC Question]

I am using LAVA iris x8 mobile. whenever I open any application it gets close after some fix time period. For example, suppose I am watching video, then after 30 seconds video gets closed, then Gallery gets closed after same time, then menu screen gets closed after same time. I have formated my mobile. Did hard reset using mobile option, Installed update through flash tool. I did everything for this. But problem still remained. Installed OS is Android Lolypop 5.0. So please suggest me some solution for this.

 

[chanchan05]

What do you mean by close? The screen turns off, or you are bumped back to homescreen?

 

[Amol Mohite]

Not directly bumped back to homescreen. It randomly close like we press back button. I have mentioned one example of video play.