Twice now when I have been washing bath sheets with Tide HE powder and STPP the machine has defaulted to a 4th rinse. I guess I was not careful in loading them and they had trouble distributing for the first spin. If the load distributes evenly, the machine will very slowly ramp up to full speed which usually spins out the wash water so gradually that there is no problem. If, however, the load does not distribute evenly after two or three tries, the machine just hauls off and goes into a spin that is slow enough to prevent crashing and banging from the unbalanced load, but is fast enough to spin out lots of water at once. With these bath sheets, that means it soon is choked with suds and has to stop and drain. It tried that twice, without success, so the load did not spin very much then, when the timer was about to show 35 minutes remaining and go into the first of three rinses, the time suddenly changed to 45 minutes and it began filling for the extra rinse. It managed to do a successful rinse and spin before beginning the usual three rinses. There was very little foam in any of the 3 rinses. All's well that ends well, etc.