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Does yours use a power supply jack, or is it hardwired to the board? Ive seen plenty of power supply jacks and plugs that break internally. But the way it acts up when you shut the engine off seems pretty consistent, besides you have basically a UPS for it now, so I dont think its a main power issue.
Hows your ground? Is it connected right to the car frame, or another ground wire that might be getting fishy signals when you kill the engine?
I also wonder if it might be getting a spike through one of the data input lines. Maybe try higher value resistors in the data lines?
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Winter daily driver, parked most days right now
Summer daily driver
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