Description of issue: Error "F51" erroring during the wash cycle.
Solution: replace the sensor part #"AP4539632". The sensor detect motion between cycles.
I removed the sensor that is mounted to the bottom of the washer on the coil, disconnected it and sprayed die electric cleaner into the connections and the connectors. Put it back together and no problems ever since. I may hang on the the sensor I purchased though, this may be an indicator this part is going bad.