Shoutbox

Hey for the past several, months I should say, I have had troubles with audio in firefox, I would get audio in it for about like half an hour, and then no audio would come from firefox, weather it be youtube, a flash game, or anything which can play sound in firefox, would not work. however If i enter that same url in IE, i get sound. After installing multiple versions of FF, i still get the same problem, works for an hour than mysterously stops. Any suggestions would help, thanks.