Mechanically these mounts are fairly simple. So if you have ruled out anything mechanical eg cable snags, internal cable issues, cam spring etc...and timin belts, then it's time to look at electrics.
I had a strange issue for a while that I thought was electric and it turned out to be a crack in one of the timing belts with a build up of material from the belt creating a high spot that stalled the motor.
Check on electrics next. Check all cables on circuit board are sound. It slides out and you can check it easily. Check encoder connections on motors. Also make sure encoder is tight and not moving relative to motors. Failing this try a new Board as per Phil's offer.
I'm sure you will sort it....shame you have to though...
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