For about the last month or so the clothes (especially sheets) would just roll into a ball (like a big sausage) the wouldn't dry. Kept readjusting the clothes. I went on the internet to see what the issue could be and found lots of advise about shaking out the sheet and clothes first, using tennis balls, and using fuller or smaller loads. None of that worked. But I finally figured out that the reason they roll into a ball is because the belt around the drum is slipping or stretched. This slippage (especially with a heavy wet load) slows the rotation of the drum just enough so that the clothes don't get tossed enough- just rolled and then they form a big ball. The drum stopped turning just a couple days ago to I took it apart to discover the belt had a serious wear spot, and the tension pulley was also cracked and coming apart. I ordered a new tension pulley, (assembly is optional )new belt and idler spring for a total of $40 including shipping. One hour to tear down and an hour to put back together (because it's the first time). Degree of difficulty 3 on scale of 10. Called a couple local shops- would have cost nearly $100. for same parts not including labor. Time from phoned In order to drying first load 2 days. (part arrived 2 days after order- standard shipping). Very happy- did it all myself (I'm only 70 years old) . Just be careful as metal parts inside unit have shape edges (use gloves). I did not even disconnect the gas or exhausted. just tilt the unit back a little with a block under front.