I don't think I would cut out the door post. Since it is the corner post and located right at the source of the speaker vibrations, you door will rattle with every beat. It is hard to say what could be causing the speakers from cutting out. Just try to be logical about your approach. If there are multiple speakers affected then look at the amp. Does the power light flash on or off indicating a poor ground, power, or turn on wire. If it seems fine, your HU ground or power may be coming loose. If you ground to the frame of the car (I suggest against this for reasons of noise) then check it for a loose connection.
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2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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