I have the same problem with my Yamaha RN-500. So i think it's a problem in spotify connect. I almost destroit my speakers. I'll have to say that i have this problem no almost 2 months. Before that it worked perfectly.
Have the same problem with Yamaha RN-500 with latest firmware. (on connect it blasts volume to max although volume on Yamaha is set to 0 or mute).
I've re-installed and see no improvement. Sincerely i'm not very happy to test this as i have quite expensive equipment and not willing to disconnect my speakers. Question will go also to Yamaha. why one would allow volume override without proper testing.
It would be great if someone from Spotify could acknowledge here that they consider this an issue that needs to be fixed. I don't mind waiting for a fix (even if it takes longer), as long as I know that it will eventually be done...
Haven't got a chance to use the updated version a lot yet, but the few times I tried the issue did not reappear, so far so good!! Too early to tell, but if it remains that way then kudos, thank you so much!!
>> and the best darn thing is that you can even control the volume of the other device using Spotify Connect now.
Well, that's what was really causing this problem in the first place... I understand that many will see this a great feature, but I feel a little different about it. Even now with the fix, it's just too darn easy to accidently swipe your thumb across to max receiver output and possibly damage your equipment (not even speaking of scaring dog, wife, etc.). I'd really like to see a setting to completely disable the volume sync to the other device, just to have an ease of mind that something like this can never happen.