I just had my SS in the shop for the 3rd time in 3 years for the belt problem. (Same as the OP, belt was walking up the crank pulley and fraying)
After 2 replaced belts I finally insisted that the cause was not "a bad belt"
They checked more thoroughly and found that the Crank pulley was adjusted improperly.
Praying that's the end of my belt saga. My warranty runs out 3/7/14
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