THE INNER BEARING HAS FAILED DUE TO THE SEAL LEAKING , IF YOU CONTINUE TO USE THE MACHINE YOU MAY CAUSE DAMAGE TO THE ELEMENT AND DRUM. ITS EITHER THIS OR IF YOUR MACHINE IS OLDER OR USED HEAVILY,THE DRUM SPIDER(SUPPORT BRACKET} HAS FAILED. THIS USUALLY DOESN'T
MAKE AS MUCH NOISE UNTIL IT SPINS.
KEITH (THE SPIN DOCTOR), January 2005