Yeah, burning that many belts did make me a little mad. My dealer didn't do anything to fix the problem, instead they just kept giving me free belts. I have no Idea if they got them warrantied, I would walk in with a bad one and they would give me a new one. I sent the 1st one back to Doo and it was a 2 month process to get the $100 back. They did, but they said they will only do one.
Back to the dealer: I would go in every week to buy more oil and exchange a belt. I complained constantly but the owner would tell me I was the only one blowing belts. When he left the parts guy would tell me they had a pile of blown belts off 800's in the back. Every week was the same thing. The owner would see me walk in and he'd disappear. He would blame the clutching, and I would tell him its stock. He'd blame the tower brace not letting the motor move, and I'd tell him it wasn't mounted to the motor. He would blame the studs, which I had them install. I would leave the sled there for over a week to get checked out and they wouldn't even look at it. I was soo pissed with them and ready to go postal they would just give me belts so they didn't have to do any work.
But your problem is alignment. You can check it yourself, or goto the dealer. It doesn't matter it will fall in BRP specs because they have a mile of tolerance. If it falls in the gap, which every sled will, the dealer cannot do any work and get paid. THE BRP X dimension is WRONG. Most sleds fall around 36.5-37.5 and it needs to be 39-40.5mm!!! The seconday is too far IN causing a dogbone in the leg, causing HEAT, causing cords to pull. Your need to shim the secondary, normally 3mm, to stop the outside cords from letting go.
I did alot of things last yr to help. I did some mild clutching, tower brace, proper belt wash/break in, vented the guard and it all helped, but didn't stop it. This yr I did the 3mm shim and vented the Clutch tower with an SLP vent and Frogzskins on the backside of panel (photos below). My belts now last and heat is down a bunch. The clutches are cold when trail riding and only warm when off trail
If you need a shim kit, let me know. Should have more next week.
And yes, this yr I do prototype testing for Carlisle........ So belts are