How come my sound quits on my computer?

After my computer has been turned on and in use for an hour or so, the sound quits. There is an warning bulb that pops up. It says: USB Controller Bandwith Exceeded-click here to learn more.
When I click on it, a screen comes up and say to change bandwith click refresh button below. I click the refresh button below, and nothing changes. To be able to get my sound working again, I have to reboot my computer. Any suggestions on how to fix this problem?