No responses? Maybe some more info will help.
I downgraded from 6.20 Pro-B8 to OFW and then installed 6.20 Pro-C2 to see if that would help but the problem persists. I've tested in multiple games including GOW Ghosts of Sparta, Ghostbusters and Crazy Taxi Fare Wars.
If you hit either L or R Shoulder plus any buttont (D-pad, Circle, Square, Triangle, X, Select, Start) the screen goes black, sound stops, green power light blinks and approx. ten seconds later screen comes back and sound resumes.
Any insights would be greatly appreciated.