Several possible problems..... One something stuck in pump blocking water (ie sock, hair band etc) or the item being washed is one heavy item causing the washer to be unbalance (ie one pair of jeans or one towel...heavy when wet) and this causes the washer to stop before item is done spinning because it is an off balance load or lastly too much sudds, washer can not drain sudds so shuts down the spin cycle early, like when off balance (use less detergent for small loads to avoid too much sudds)