Apple Magic Keyboard turns volume down constantly
I have a 2019 bluetooth magic keyboard. Just recently it's begun turning the volume down constantly on the built-in speakers in my MacBook Pro (Monterey)and any connected speakers, headphones etc. I've tied a few suggestions found on the net, ie resetting the PRAM and deleting a bluetooth plist. Any help please?
MacBook Pro 16″, macOS 12.6