I have a 2014 commander max 1000 seems to be slipping out of high gear while driving a steady speed of 45mph or faster. It has always had a slight jerk every little bit as you drive a steady speed for long distance(1/2 mile or more). Now it’s like it’s coming completely out of gear and revs up and grinds for a second until I let off the throttle then I ease back into and continue down the road. Once I get to an area where I’m constantly on and off the throttle it runs like a brand new machine. Only slips at a long distance steady speed. I’ve replaced belts and cleaned clutches a couple times and I’ve adjusted the shift cable and still have the same issue. Any ideas or help??