While I was using my Chromebook, I was typing and then it shut down for no reason and for some reason, I wasn't pressing...

maybe it does not support that sound bar your using but sees it on the list? is it a samsung sound bar? that cound be the problem.

Did you buy the computer? Update (11/20/23): If not and you still are in school and the computer is still on the property of the district, you could get into a lot of trouble for this type of action.