When you loose drive, and then when you go into 1A and it picks up to full speed, then ease back out of 1A and it stops running again, does the forward contactor stay in and not shut off until you release throttle all the way. In other words, is the forward contactor ever dropping out on it's own. I seems like it might be loosing the turn on signal from the card to #1 rec. Maybe try to run a new wire from card #37 to rec 1 gate.
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