Hi all, first post so please be gentle 
I have Phonak hearing aids and use Bluetooth to connect to my mobile. All works well until I open apps such as Facebook etc. The aids are producing a hissing noise even when no sound is playing but as soon as I close the app, after a couple of seconds the hissing stops. Any advice would be greatly appreciated.
Thanks 
Phone is a Blackview BV9000
You’re ignoring this member’s posts.