I upgraded my G4 yesterday.
I just had a weird issue where my G4 would no longer connect to my bluetooth speaker mic. I tried today to connect my speaker mic for the first time after the upgrade. Doing a search for bluetooth devices, my G4 wouldn't find it.
I had to remove all the stored bluetooth profiles, then search for the speaker mic. After the G4 found it during the search, I was able to connect my speaker mic to my G4 as normal.
It did it to me again.
I was listening to my G4 with a speaker mic and I heard the sound of my bluetooth speaker mic powering off (it will power off if its not connected to anything.) I tried to reconnect it to my G4. No luck. I tried to search for the speaker mic, and it couldn't be found. Multiple searches could not find it.
When I got home, I powered off the G4, powered it back on, and turned off bluetooth under Bluetooth Settings. Then, I rebooted my G4 and turned bluetooth back on. When I turned on "earphone" under Bluetooth Settings, and then powered up my speaker mic, my speaker mic connected just like normal.
I haven't had any problems with this same bluetooth speaker mic in the 14 months I've owned my G4. Since I upgraded the firmware, its lost connection and unable to reconnect twice to the same bluetooth speaker mic. I'm not sure what has changed in the bluetooth part of the firmware, but something is causing it to lose connection and be unable to reconnect.
Edit: The trunked site I was listening to was fairly quiet at the time. No transmissions in at least 10 minutes.