My Amana washer spins inconsistently. Spin cycle starts and moves for about 5 seconds then shuts off. Sometimes it will start and spin completely. I have replaced belt and timer. When it starts the spin motor seems to make a loud humming noise then starts and stops a few seconds later, again not every time. Agitation seems to work fine. Pump is also working fine. When belt was first replace tension seemed to allow too much slippage. A small increase in spring tension seemed to fix this. Thanks for any help or advice.