So recently in the last few months, my heart rate broadcast would just stop randomly while I'm on my bike rides. I use the broadcast in order to send my heart rate to my Garmin Edge 1030 Plus cyclocomputer. I haven't had this issue ever with my previous Vivoactive 4 and not for the first several months of owning the Venu 2 Plus. I can't remember which firmware update that this started on, but it surely annoying.
I even tried to lock the screen to prevent accidental button push, but that didn't work either.