I am not sure if this is the correct place for this post. If not kindly refer me.

A Samsung galaxy S2 device randomly launches apps (any kind). these apps immediately relaunch after forcing stop. when media player launches repeatedly the battery drains very fast and the cellular is practically unusable. 

Is it possibly a touch screen issue?

I have searched online and found no similar problem.
I have tried factory reset to no avail. 

This problem just started with no special update, root or installation as a cause.

Android version 4.1.2
ROM version 3.0.31-816988

* what can be the cause? 
* What other steps can I take?