watch freezes when accessing music menu or trying to connect headphones

Yes. Yesterday when doing a 15k run, the sound disappeared several times, even though the player showed the music still running. I had to disconnect and reconnect the phones in the watch to get the sound back each time. 

I have the similar experience, but with previous firmware. I have not run with music that long, about an hour. Last the music stopped coming from the earphones right at the beginning, had to reconnect. Not yet tried music with the latest buggy firmware:)

Well, didn't have this problem with the older firmware, but I only ran a couple of 5k runs with it before the update. Have not had the problems other seem to have with the new firmware, but given that I mainly use the watch for running and strength it might just be that I haven't yet strained the watch enough to provoke the bugs.