Xp1000 clutch jerking

I have a 2015 xp1000 2 seater with 422 mikes on it and last night I noticed the clutch starting to jerk during engagement. It runs and drives fine after say 1 or 2 mph but while it’s trying to get moving it’s jerking like it’s going in and out of gear if that makes sense. In low or high range, not been under water and I haven’t ever smoked or slipped the belt. Any ideas what’s going on? Running 30" roctanes but there again have never smoked the belt. I don’t have the clutch cover off yet so can’t comment on the visual condition of either clutch or the belt.