Not wanting to through any gas on the fire, but I had exactly the same problem on an early production TN75S. Mine only occurred when it was damp and I was running lots of lighting. No way to get computer to reengage motion until I literally jumped the battery probably creating a little "surge" that reset the computer. Dash / Computer was replaced several times. New Holland ended up buying back tractor and replacing it with the TN75D that I've had for 8 years. And yes, on the TN75D, I've had reasonably significant wiring, hydraulic, injector return lines chewed into by mice so definitely look there.
The computer issues were incredibly annoying as I would end up with a bucket stuck in my dump body on my F350, tractor engine running, but unable to get tractor to move (on my farm in the middle of nowhere late at night) . If I turned off tractor engine it would not restart until I jumped (jolted) it.
For what it's worth
Andy
