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I had this exact thing happen a couple of days ago. Ocurred after hitting the "lock" pad on the passenger side door handle. Basically it was a very loud rapid thumping type noise coming from the speakers. It was loud enought that my wife came outside from the house to see what was going on. I tried hitting the start/stop button, cranking the engine, and then shutting everything off to no avail. I was just about to disconnect the battery when it stopped on its own. It hasn't happened again, and I have no idea what could have caused it.
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