There is still one big issue for me regarding to volume control of grouped rooms.
In the past the most comfortable way to set all grouped rooms to the same volume level was setting the main slider to zero. Then you immediately were able to raise volume for all grouped rooms at the same level.
Now I have to wait for about 8 seconds!!! after setting to zero before I can raise volume in sync. Otherwise the grouped rooms won’t set to zero.
I really hope Sonos will find a way to get this sorted. A maximum of 2-3 seconds to wait would be welcome for me, or an optional button in group control would be fine to activate synced volume for all grouped rooms (maybe at level of the most „silent“ room of the group).