20.16 The watch does not connect to HRM PRO+ immediately

After updating from 19.x to 20.16, it happened twice in a row that Enduro 2 did not immediately connect to the HRM PRO+. Are any of you experiencing similar problems?

EDIT: I then removed the HRM PRO+ strap from the watch, tried to add it again and it still won't add. I will try several more times.

EDIT2: I can no longer connect the HRM PRO+ to the watch. Don't try to remove it and connect it again, it probably won't work.