Why Apps get force stopped

[AC Question]

Some apps work in background. They stopped workin in BG. When such apps are launched, for some minutes the work and again get automatically "force stopped". Is it virus problem. Is there a repair option in Samsung for their OS.

 

[B. Diddy]

Welcome to Android Central! Which Samsung phone? What do you mean that they stopped working in BG?

Any power-saving modes turned on? Or 3rd party power-saving/RAM booster apps installed?