i see you're fairly new here, what OS are you running? try updating to at least .75 if you arn't on it already, if you are already, maybe try one of the beta OS's to see if it resolves your problem. I've had strange problems where just an OS re-install has fixed the problem. but i do know if you are listening to music and you get an incoming e-mail or txt or bbm it will mess up your volume. thats a known bug with almost ANY OS thats been available so far. i can't say all OS's have that problem because i have yet to test them all.