sometimes "photos" videos on iPhones will mute the sound and I have not got around to remedy that yet.
what BT speaker are you using?
I had problems with several cheaper ones, until I purchased a JBL Go which I am using now (which never had a problem with) but with a stereo plug.
I think one BT speaker was a murrkury and I had a Kodak one that is now sitting in a recycling center now.
Bose Soundlink Mini II. I could use a cable instead of Bluetooth, but if Bluetooth has issues then I'm only kicking the can down the street until a potentially later date when I WILL need that functionality, and it will be fubar, unusable. I have the larger Bose speaker, so if I can find it I can see if it works better.
Question: Is it a supported BT version that could be an issue? Sounds hard to believe, but figured I'd ask...