Intermittent issues with broadcasting HR from Garmin

Hello! I’m experiencing difficulties with broadcasting my heart rate (HR) from my Garmin 735 watch to Zwift, which is running on my Google Pixel phone. I have a Wattbike Pro as part of my setup. To begin with, I enable HR broadcast on my Garmin watch and launch Zwift, which is able to connect to the Wattbike sensors and receive the broadcasted HR. However, the connection with Zwift drops after just a few minutes, and it doesn’t reconnect, leaving me with a 0 HR reading. The Wattbike still shows my HR, so I’m certain that the broadcast is working correctly. Could you help me with the issue? Thanks!