oldjohnboy13

I have a copy of mame that works.....ok i guess. its a bit choppy but not so bad I can't play. but for some reason in the middle of a game the audio will cut right out and it will just be loud static, and it will last for like 5 min. I actualy think i get static more then arcade sounds. and its dosent do it at the same spots all the time? can someone please help?