Bluetooth sound switching between BT speaker and phone speaker

[JohnC77777777]

S25 ultra. My Bluetooth is connecting fine to my Bluetooth speaker, but every now and then the sound stops coming out of my Bluetooth speaker on my desk and switches to the handset (S25) speaker. The Bluetooth is still connected it is just that the sound is coming out of the handset. If I turn the Bluetooth off and then turn it back on the sound moves back over to the Bluetooth. I have tried this with a case and without a case and no changes. It has also happened both with my Bluetooth speaker on my desk and in the car, so I know it is not a problem with the Bluetooth unit, but has to be something in the phone. 

Does anybody have any thoughts?

[jppanucci]

Attempt modifying the Bluetooth AVRCP version within the developer options; the speaker may only support a specific version.

[JohnC77777777]

Will give it a shot. Thanks.