Has anyone had a sensor board fail in there SP motors??

I have new V3.0 17.5 with a red timing board that I had from a 1 year old MMM motor and has been fine for many race meets but yesterday mid way through my final race throttle became very touchy.

Brought it in and found anything less than 30% throttle it would cog like crazy (4wd team durango)

Replaced the sensor wire and it was the same, when I got home I put the 0-10 Black timing board back in and the cogging is gone.

What causes this issue anyone had it before??