Same here. Sometimes I need to do it twice, then it’s usually good. I’ve instances where it’s dropped off in the middle of the wo (rarely), and sometimes it drops out if I switch to another app (typically Spotify/Netflix/etc.). When it does drop out it sometimes comes back, other times I have to do the whole disconnect/connect thing again. I know it still transmits as my Wahoo Headwind is controlled by my HR (via BT). I use android with ANT+ dongle.
Note: I never had this issue with my old phone (S8). This had ANT+ built in, while my new and fancy S21 has this feature removed…