Trouble with rega white belt seating properly


I just got the new white belt for my planar3 and that one along with my spare I never put on roll up and down and will not stay in place.My original belt is 10 years old and doesn't do this.I put in the subplatter upgrade a few years ago,I don't see that should be a problem,it wasn't with old belt.Does it need to breakin?Any ideas?
playpen
It probably has to do with your motor being seated properly.You have to take off the belt loosen the screws on the plinth that are either side of the pulley.Then pull the motor down so the top of the pulley is centered and lower than the sub-platter.Tighten up the screws and put the belt back on.It should be fine now.
I returned the first white belt I purchased due to the same problem. It is a manufacturing defect. Ask for an exchange.
Thanks,I tried to loosen screws and pull down the motor,couldn't get it to move down.The place I bought it said to try talc power which I can't find around here.I'm returning it for replacement as Frank had same trouble.It jumps down about quarter inch and then woobles,goes up,hold steady for a while and does same thing all over again.The belt is riding high on the subplatter when it holds for a while.