I have a Frigidaire affinity model # ATF6000FSO Front loading washing machine. Unsure of age probably 5-10 yrs. It will not spin out. It agitates, it drains, but it will not spin out. When you put it on the spin only cycle it just drains and tumbles back and forth. It will not go into high speed spin. When I put it in Diagnostic mode it will spin, as it gets up to speed it makes a loud thumping noise. Once it reaches high speed the sound stops. As the drum slows down it starts thumping again. Can anyone tell me what the problem is, Thanks.