Morning 
Rather annoyingly my Sena SMH & BMW Garmin Nav V have developed a problem.

I have the SENA SMH5 linked to my BMW Garmin Nav V and linked to my mate’s Sena 10u

All works well , I listen to my music from the Nav V , I can even press the button to talk to my mate but then it all goes wrong. When I press again to cancel the intercom the music doesn’t come back on and the Nav V locks up.
It seems to be something to do with the bluetooth connection.