I have a 2014 KICKR with around 500 hours of use. I noticed recently that all of a sudden, when I stopped pedaling, the pedals kept spinning. Also when I backpedaled, there was resistance at the cassette. I contacted Wahoo and apparently there is an inner spacer under the cassette that is subject to wear over time. I ordered two replacement parts so I could replace the worn part and would have a spare. After the replacement, the KICKR runs like new again. The attached photo shows the old and new spacer. Note the issue is the wear and the top where the metal had worn away and not the scrape marks on the outside. The scrapes are due to the spacer being stuck and requiring pliers to remove.