I had nothing but problems with my 2018 Kickr and Stages power cranks. I tired to have Stages dictate the Kickr resistance but found a lot of drifting power as the Kickr warmed up. Whoever decided that smart trainers don’t need thermal compensation should be fired. Putting 200-300W into a trainer turns into heat in the resistance system. You can calibrate a Kickr after “warming it up” but it assumes a consistent input. Ended up selling the Kickr after a few months and going back to my eMotion rollers and Stages power.