My last one, I thought it was my bike at first, I felt what I thought was in the front crank, like I was hitting something or somethings wrong in the bearings. Which progressed to get worse and then when it became really pronounced, you could tell it was the kickr. From there, the kickr took a nose dive. This took around the same 24 to 26 hours of use as the first one that failed me. Local bike shop took it apart, found a mangled washer and there was play in the flywheel. The bike was bought in July 2018 Trek Emonda SL7 with Ultegra Di2, so I was really hesitant on blaming it on the bike. Bike shop swapped it out. I’m on my third Kickr, about two weeks of use, around 6 to 7 hours of use per week. So, I’ll find out in the next two weeks if this one holds up.
Good luck, hope you don’t have an issue with yours. I still support them even with my bad luck so far.