I had the same issue with my 2010 GTX 155. In addition, once in a while the IBR gate would get stuck,,,,,initial in forward, but then later in Neutral and hence I couldn't go anywhere.
I tracked my problem down to a 3 amp fuse for the IBR Module. This is NOT the big fuse for the IBR motor or actuator. On my ski it is in the starboard box of the two fuse boxes. Changed that, and all problems went away.
Jaybeaux
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