(2010 RZR-S) So I went for a ride yesterday and about 25 miles into it we did a little rock climbing. At the start of climbing over the first boulder I had it in HI/AWD. It got about a 3rd over the boulder and stopped moving and I smelled the odor of burning rubber. I figure I spun the belt so I stopped and put it in LO/AWD and it went right over the boulder. After we cleared this section I noticed that now when I take off from a stop my RZRs clutch seems to engage differently. Now there is slowly starts to move and then it grabs and kinda jerks. It then drives normal. I looked at the belt and it looks normal. What could be the cause?