I have one of the earlier bikes (purchased in 11/2019) and the signal for ANT+ seems to be fairly weak. I have paired it with a fenix 5 and fenix 6 and received a similar issue. When riding with my hands on the handlebars things are mostly okay, there are no signal drops. However, if I sit upright the signal will normally cut out - I know this because I'll receive a notification on the watch.
I do not think it's the watch since I've used two different watches and had a similar experience. I have also tried the same watch on a TACX NEO 2T and did not experience the signal loss.
The bluetooth signal seems fine, it's paired to an apple TV that's quite a ways away and that connection never seems to drop.
This has been happening since I purchased the bike.
Any thoughts?