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1987 944 Speakers cut out during operation

Electrical

Vehicle Information: Model(924/944/968): 944; Year: 1987; Body Type: Coupe; Total Mileage: 128,000;

I have a 1987 944 N/A with the standard stereo option. During normal operation of my CD/Radio, the speakers just drop out. I am on my second replacement head unit so I don't think that is the problem. I currently only use two speakers in the doors. Normally the sound will just drop and then return. It is much worse during periods of rain and very high humidity. It appears to be caused by hard cornering and sometimes rough roads. I though I had it fixed with the new unit but it apears to still be there. Is there any type of relay or connection between the head unit and the door speakers that would be sensitive to shock? I also noticed some static today prior to the speakers dropping out.

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