Car audio

I have an 09 enclave and all the speakers have stopped working except the 2 small speakers up front on the windshield pillars. All others have no sound but work intermittently once or twice a month either the left side or right side. Is there a solution to this problem?
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Answers
Here's a video on how to pull yours out if you want to do that:
Remove Stereo, 2009 Enclave