Hi @alastair_semple welcome to Zwift forums.
Shuji at Zwift HQ here. I’m looking at some of your recent session logs on our server. I see some cases where you have a Wahoo trainer paired to the game, and others where there’s a Tacx paired.
I also see an ANT+ dongle being used sometimes, and others when they’re paired via Bluetooth Low Energy (BLE). Is this a case where you have multiple training stations in the same room?
There’s an important difference between Bluetooth connections and ANT+ connections. ANT+ creates one-to-many connections. BLE creates a one-to-one connection, meaning if your trainer is connected via BLE to the Garmin Connect app on your mobile phone, or to your computer head on the handlebars, that signal is not available to the Zwift app. Please make sure that your Tacx’s BLE signal is not auto-pairing to something else.