How long have you had this problem and when did it start. Check rollers for flat spots, alignment of pully's, grooves in pully's causing a hangup on decelleration, needle bearings in clutch housing, clutch pully not opening or closing without bind. How is the belt bereaking, shreadding or clean brake, also check broken belt and compare to new belt checking for signs if scuffing or unusual wear. You can put the buggy up on stands and operate the cvt to see what it is doing. Many do not when a belt breaks inspect the clutch halves when spread for debris. The best way to check is to totally disassemble. Sometimes a small piece of rubber of a strand will wedge between the clutch pully halves causing the pully to hang. At that point the belt will have gobbs of play and be flopping inside the cover. This will tear up a belt in a hurry. So check the operation of the cvt with the back up on stands and cover off then observe.
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