Companion on Apple Watch - Can’t Ride then Run

Using Apple Watch with Companion app to track HR. Works fine when I ride. Then, if I get on the treadmill, the Zwift app on my iPhone can’t find my Apple Watch - Companion app on the watch just says UNPAIRED. Tried rebooting phone and watch but no luck.

To get it to work, I have to go into the Watch app and uninstall/reinstall Companion on the Watch. Multiple runs after that work fine as long as I don’t ride.

However, the next time I ride again, it won’t pair again. Have to uninstall/reinstall again but then it will pair as long as I just ride and don’t run.

Anyone else having this issue?