I have to ask for everyone that has stiff towels, to do a test. Rewash them "without soap" and see if there is any suds! I did, and there was so much soap suds' I have a Whirlpool duet HT 9200sq, I always wash them in sanatize cycle with 1/2 tablespoon HE tide, I have soft water. There isnt a soap buildup in the washer, because when I do the clean cycle with nothing added there is no suds. So I think that these FL washers dont use enough water to get the soap out of the towels, I had to wash them 3 xs and had to do 3 more rinse & spin, I was so burned out of washing, it took all day, there was so much soap in them it was crazy. When I do whitest whites cycle with 1/4 cup of bleach same thing happens and also to Jeans. I do have a problem with them tangling up too. I am doing another thread about that.
If you do please let me know. Thank you. Marie