I would suggest you have a look at the door seal where it contacts the drum rim. May be that the rubber has started to dry out or gone squidgy and causing the friction to make a racket and warm up causing the smell when the drum is rotating at it's fastest. There will be a clip or spring inside the door under the rubber holding the seal in place to the machine body, un clip this and flip the rubber over and take a look at the contact area to the drum. If anything looks iffy replace the seal, not a difficult job and cheaper than drum bearings.
Tractormanclive, January 2017