Rode today on the best day I've had so far on the Pro. Deep powder and beautiful sunny day. I noticed that the throttle was accumulating ice in between the block and the thumb lever. No big deal, cleared the snow and went on. However, as the day went on it got much worse. To the point where the throttle would not pull closed like it should. It felt like I had cruise control. You had to push it closed or the sled just kept moving. This made it impossible to ride near the trees. I wasn't too happy and I'm hoping that I can spray some silicone or something in the block to help the buildup of ice. My buddies Pro did the exact same thing. Looks like a nasty problem when it happens. Anyone else?