drop outs when connected to Bluetooth headphones and HRM Pro

Hi,

When connected to Bluetooth headphones (MEE Audio X7 Plus Sports) and chest strap (Garmin HRM PRO), I have the first 10 minutes of intermittent connection with the headphones AND with the chest strap (drop outs every 10..15 seconds). After almost exactly 10 minutes, both connections stabilise and everything works perfectly until the end of the workout. The HRM pro is connected wih ANT+. The behaviour is reproducible and occurs with SW version 10.44. I only use the music function occasionally, but the behaviour has certainly not occurred with older SW versions. (I'm not sure however with which SW version I last used it)
Has anyone noticed the same thing and perhaps found a solution?

Thanks