I would definitely check the 3 plug in boards in the tender. I think there are the sound, amp and r2lc boards there. I would remove and re-seat them in the 24 pin board firmly.
It really sounds like a loose connection someplace. If you open up the engine and remove the shell, check the antenna wire from the handrails to where it is plugged in. Also, I would check all the other plugs into the motherboard there that they are firmly secured.
Something is loose?
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