Hi again!
I was the author of this link and I just wanted to update my progress on this since I have taken steps to try and solve it.
I missed an important detail in the old post which is that I have a Google Wifi system, which I have read is infamous for causing problems with Sonos systems. It also means that I cannot change the channel on which the wifi operates as I don’t think Google Wifi has that capability.
For the last few hours I have been browsing and seeing many different solutions for Google Wifi systems operating with Sonos and I keep seeing a) hook up a speaker to the main google wifi hub which connects directly to the modem b) disable DHCP on modem c) get a Sonos Boost.
I have done option A already. My setup here is a One, Five, Beam + 2 Surround Ones, and a Move. I moved the Five to be connected via ethernet to the main Google hub I mentioned. I also tried alternating between all the SonosNet channels on the app after I moved the Five, and nothing has changed.
I have not tried option B or C, since I don’t know exactly what disabling DHCP will do and I don’t want to invest in a Boost if there’s another solution.
I’ll likely talk to Sonos support soon, but I was wondering if there was an important step I missed or if there is further action I should take. Thanks again for all of the replies on the previous post!