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I have a '16 pro s sb with 4200 miles. On my last ride this season my belt started slipping after getting stuck in 3' of snow. Primary was really hot. (Same issue with a new belt). Made it through the day but would slip whenever starting to move. Ran good as long as I was moving. Got home and took everything apart and installed new rollers, buttons and bushings. Nothing appeared to worn very bad except the plastic washers on each side of the rollers (melted from the excessive heat). Took the secondary apart and checked/cleaned and put it all back together with a new belt and it's still slipping. What else would cause this? Please help.