I don't own a WT table but if the belt really is just a .004" thread I would have to agree with Wayner. Whenever you grab the record, you're immediately changing the speed of the platter which is essentially sharply jerking the belt. Depending on the material used, the result would be either a stretched or broken belt very quickly. I don't think DDs, rims or idlers would have any problem dealing with hot swapping. As for the OP, I have no other advice, aside from what's already been mentioned, as to why it's happening more frequently. Lower quality belt material now?