I’ve had a few 3000 series machines with that problem. Miele rebuilt my original one, but it failed again within a couple of weeks after just replacing the seal and bearing, they ended up having to replace the spider and back plate as well. 10 years later, it’s still going. That generation seems to have a weakness in the design of the bearing/seal and the backplate. I have three others in storage where the drum rubs on the boot.
There is no adjustment when fitting the boot, so if it’s rubbing on inner drum, you’ll have to pull it out and refit the seal and bearing again. Be aware though, that it make take more than the seal and bearing to permanently fix it.