I've had a MX5200 since last September. Just under 50 hrs. Last week in single digit temps I was blading and bucketing snow. After an hour or so I dismounted and tractor quit showing an opc code. Thinking it was the seat I wiggled the switch and restarted the tractor. This happened twice more over next hour. Finally the last time it happened I could not restart the tractor no matter what I did. Wiggled seat, treadle and pto. Nothing. With negative 20s in the forecast I towed it back to my garage with my old Ford 850. Wouldnt start for 4 days. 5th day temps got back into the 40s. Wiggled the treadle and it fired right up. Ran fine for several days in 20 or 30 degree temps. Tonight I moved snow for a half hour in lower single digit temps. After returning to garage and dismounting, the tractor quit showing the opc code again. Five minutes later I was able to restart it. Can anybody explain what is happening? I checked the resistance in the seat switch and it appears ok. I believe the treadle safety switch may be the issue. Is it possible it is getting iced up?