I have this problem with F5s and Galaxy Buds +. They work fine when not in Walk or Run mode. When in a GPS using mode, and arm down, music is breaks up, switches between channels and is very unpleasant. I can hold my wrist up to my face and the music plays fine so it is a distance problem. Guess I could walk with my watch held next to my head but I look weird enough as it is.
I suspect it is a battery power problem that both apps running together weakens the Bluetooth transmit signal. Or interference somehow with the Bluetooth signal. Anyway it is unacceptable for a watch at this price point. Sounds like from reading it didn’t get fixed in the F6. My question is did it get fixed for the F7S. I am considering buying the 7 S but not if this issue hasn’t been fixed.