I have the exact same problem. Funny thing is, I never had this problem before I took it in for maintenance...burning rubber smell from fan belt does not occur when the bottom plate is off and machine is upside down. Spins perfectly until I put plate back on and put it on the floor. Low pile, high pile, hardwood, still does it. Took it back and they said I needed to replace the fan belt (which was brand new). They replaced fan belt. Problem began again after first use. Hate to sound paranoid, but do "repairers" every "fix" it so you have to buy another one???
Jean, July 2005