I started using TrainerRoad about six weeks ago with my Stages single-sided crank power meter on a mag trainer. I’ve found that when I hit about 170RPM both cadence and power drop out and just display zero during a workout. As soon as I drop the speed down, power and cadence are displayed again. When I review my workout it recorded zero for that period.
It’s a relatively new battery and battery life is reported fine. I calibrate before every ride, and have tried moving my iPad directly next to my cranks with the same issue. I’ve also moved the meter between two bikes on the same trainer with the same result (converted my hybrid into a somewhat permanent trainer bike so I can stick with this structured training thing!)
Side note, when using the Stages meter outside with my Garmin Edge I’d usually max out around 1,240W. I did a quick free ride test tonight on the trainer and topped out at about 1,029W. Of course… this was directly after doing Tallac with 45min of sweet spot. But it makes me wonder if it’s normal to see a difference in power on a mag trainer vs. outside - it’s a crank meter so it doesn’t immediately make sense why I would…