Acer Aspire 5100 Sound Problem

I am having an issue with the sound on my laptop. It will play videos and music, but at some point the sound just....freezes. It is like when a CD has a scratch and it plays the same two words over and over again. Most of the time the screen is not frozen and I can click to exit out or shut the computer down. The sound, however, does not stop when I shut it down or unplug it. It only stops when I remove the battery. Any suggestions would be appreciated.
 
I have an Acer Aspire 5332 and this used to happen to me but when it used to happen I would open up task manager, go to processes and find explorer.exe, then I would click it click end process then go to the applications tab and click new task, then just type in explorer.exe this fixed it for me and it happened for a while but went away on it's own. Hope this helps you.
 
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