The one issue that's repeated several times for me, is a loss of heartrate monitor connection during a ride. Prior to today, the only time I had a problem is when I'd take a brief break during a ride (bathroom, fill water bottle, etc.), then when I returned to the bike, the heartrate monitor would no longer be transmitting heartrate data, even though it still showed connected on TPV. Today the issue occurred again while I was still riding (about 50m into a 60m ride). I never left the bike, and never stopped pedaling ... around the 50-minute mark, the HR monitor stopped transmitting HR data, and this is on a brand new Polar H10 monitor, which worked great the first ride I used it on.

I am an AppleTV user, and I always connect HR first, before connecting my Trainer. This is not an AppleTV issue as I've used this exact setup for the last two years with Zwift, and never once lost HR data during a ride.