During our great Northwest snow I took out my 2006 MXU 300 to play in the snow. The quad only has 22 hours on it. While going round and round in the snow the transmittion or something would kick out of gear, come to a near stop and then grind its way back in. It will only do it if its in high gear. I have checked the shift rod and netural position and it is OK. Any one have any ideas??