2-3 hours of CONTINUOUS play?? That's one LONG playing record; is it 2 rpm or something??!!
Seriously, in all my years with my WTT and now my Basis I never had this problem. Since no one else has responded, I would suggest calling or contacting Well Tempered, not sure if lubricating can handle this and they were very helpful to me years ago when I had questions. If the motor is defective and it's under warranty they'll likely send you a new one (and they might even do it if it's not under warranty, if they're like many high-end companies).
By the way, have you been giving the belt a half-twist? Unlikely to remedy this problem, but I always found that the table sounded better with that tweak!
Seriously, in all my years with my WTT and now my Basis I never had this problem. Since no one else has responded, I would suggest calling or contacting Well Tempered, not sure if lubricating can handle this and they were very helpful to me years ago when I had questions. If the motor is defective and it's under warranty they'll likely send you a new one (and they might even do it if it's not under warranty, if they're like many high-end companies).
By the way, have you been giving the belt a half-twist? Unlikely to remedy this problem, but I always found that the table sounded better with that tweak!