I'm not having any connection issue between the Garmin/Tacx app and the Neo Bike Plus.
However, connecting with Zwift has problems. During a 72 minute workout I lost connection 3 times with Zwift. I've tried both Bluetooth and ANT for all sensors in as many combinations I could think of. I've also tried changing HRMs - Polare H9 and Garmin 010-12883-00 HRM-Dual Heart Rate Monitor. Anybody know what the trick is to staying connected to Zwift?