Welcome..I have 23 years of Experience In the Appliance Repair Field..Working directly with All Major Appliance Brands...Sorry to hear you are having this problem with your washer..Is the belt being thrown off only in the spin cycle and not the wash cycle..?
I beleive its only in the spin cycle, but it could be happening in a wash. I notice it when it stops. The last time it was at the begining of a spin. I've also noticed that the belt is wareing a grove on the back of the outer tub.