I have been having an issues with my garmin dual hrm connecting to a laptop. Will connect to iPhone and will connect to laptop……but not every time. And once it stops connecting it seems like it takes 20-30 attempts and then reconnect and displays my heart rate on screen. No harm to Zwift support but they have been useless with dealing with the issues and just told me to connect through zwift companion and that all I can do.? Any help welcome?
Hard to say without more information about your full setup and surroundings. All I can say is thst I have used the Garmin Dual for several years with iPad and Apple TV, as well as with a Concept2 RowErg, and have had exactly zero connection issues.
Try changing the battery… Maybe it’s empty!