Lately Zwift calibration fails to work. It either freezes on the way up, or spins up to 23mph, then tell me to stop pedaling, and then it freezes on the way back down, usually at about 5mph, then it says Failed. I have tried all the usual fixes (unplugging/restarting all the things, etc), and I was unable to get it work today. When I tried to go ahead with my ride today anyway, the resistance and watts were wildly inaccurate. I finally had to end the ride.
For reference, this is a CycleOps Magnus trainer that I bought from my bike shop in November, and it was working fine until the last week or so. I’m using an AppleTV device, and run Zwift companion on my phone at the same time.