If you’d like to switch back to ANT+ at some point down the road, please ensure Bluetooth is disabled from your Windows Control Panel before pairing to Zwift. While the two protocols shouldn’t interfere with each other, I’ve noticed that while communicating over ANT+ FE-C, if there are strong Bluetooth connections in the area or a Bluetooth receiver periodically scanning for new devices, that can cause dropout over ANT+ and generally, when dropout occurs, resistance ends up noticeably affected.