Agent 47 thats the answer I was looking for. Thanks for the quick response.
Just finishing up the retrofit of an old arcade cab I picked up at an auction and after a night of playing I noticed when the gf mashed the buttons it tabbed out of my mame game and went back to hyperspin!? I've narrowed it down to the P2 2 and 3 buttons which map to q and s when hit at the same time I can reproduce this error. Any suggestions? I'm assuming it's a hyperspin hotkey but i could very well be wrong.