I was riding when I lost my Ant+ speed/cadence (from Zwift). I still had SRM wired speed and I was moving so I should have had Ant+ speed/cadence. I checked pick up alignment, decided to install a new battery, and still couldn’t pair the Ant+ speed/cadence with Zwift. No speed/cadence found. Tried this a few times. I went to the search screen from the “I’m done” screen, clicked on the icon on the right for sensors. I never stopped Zwift the whole time.
I finished my ride on Zwift to save it (it logged appropriately on Strava) in order to troubleshoot more. After the Zwift window closed I exited the Zwift app.
I unplugged the Ant+ dongle to check that, got the appropriate “No Ant+ Dongle found” or something like that. I tried to pair the sensor but Zwift/computer couldn’t find it. Tried this a few times.
Finally I restarted Zwift (Mac 10.7.5) and it immediately found the speed/cadence sensor.
I got back onto the island. The nice thing was that I had the green jersey when my speed/cadence sensor stopped working. After about 10-15 seconds on the island the second time, with the new battery in the speed/cadence sensor, the green jersey appeared on my back. I checked the leader boards (by clicking on any other rider) and my time from before was still there. I remember because it was a PR for me without using any assists.
The whole time I had Zwift running on my phone (Android). It paired up pretty quickly once I got going again.