Another thought is if the wiring for the VSS runs very close to the door lock relay, the electromagnet in the relay could be sending a pulse down the wire. Or I have seen on a lot of relay sockets, they put a diode across two terminals to stop backfeed when the relay trips. Perhaps if there is not a diode there, it might be causing some issues.
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Winter daily driver, parked most days right now
Summer daily driver
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