I'll contact after-sales in the evening to check, but I'd like to consult the community if you're having this problem.
my product is era 100, android sonos app volume control still has a 5 second delay, is it fixed? my app/system has updated. help!!!
there is a sonos reply: https://shorturl.at/fI6KC
but it's 4 month ago, i don't know if you fixed it.
Note that I don't think it's a wifi network issue, as my streaming music playback, pause, and resume functions are instantaneous. It's just volume control delay