HRM and cadence data dropping

I have had very good luck with my setup. A 2016 MacBook Pro using Garmin BLE HRM and cadence sensors. Today I had a lot of dropouts on both of those sensors.
I don’t remember when the dropouts started. At some point in my ride I added bluetooth headphones to listen to music (my kids got tired of listening to my jam). Does anyone have an experience whether playing music while Zwifting affects data thruput? It didn’t seem to affect the Kickr power data.
I rebooted after the ride and will try again tomorrow.