Hey Andreas, a few things:
- What kind of ride were you on? Free Ride or a workout? And if you were on a workout, did you have ERG mode on?
- Were you paired to the Tacx App at the same time as trying to pair to Zwift?
Did you try troubleshooting using your BLE guide? https://support.zwift.com/en_us/my-bluetooth-signal-is-dropping-running--BJkESEzU7
Just a heads up, we are investigating resistance issues for the Tacx as noted here: FIXED: Trainer Resistance Issues (Mainly on iOS Devices)