Display timout resets to 15 seconds occasionally
I suspect that the 'battery saving software' might have caused the issues. Did you experience these issues before installing the app ? There is a couple of ways which might help restore original settings :


A factory reset might set it right.
Alternatively if you have a backup of your original firmware you might want to try reflashing your phone after backing up all data.


ps :  The name of the app you were using might help out.