Mine has done it twice also - unplugging the TM straightens it out - not sure what the deal is, but it doesn't happen very often.
I have a "Big Foot" TM switch between my 2 batteries (24vPD65) and it's located close by the drivers seat,
The few times it did wig out I used the remote to turn it the other way until I could get to the BF switch & kill power.... I'd like to know what JOI has to say about it....