If it is leaking from the door and there is nothing obviously wrong with the door, then the door bellow needs to be replaced. A small ripple can be enough to allow water past and on the cleaning cycle, more water is used than other wash cycles. So it's possible for the weak spot to be at a point it is only reached by water during the cleaning cycle. If it's not from the door, then there is a hole somewhere letting water through, or one of my favorites, suds coming from the vent in the left top back corner leaving a nice trail down the back an onto the floor.