For the folks that have Sonos Era 100 and doesn’t have any wifi issues, may I ask what wifi mesh system you have?
I currently have Netgear nighthawk mesh system and it could be that my mesh system is not compatible with my Era 100s and this is after trying different ways to get running. I also have the Era speakers on static ip which work for a bit till it doesn’t or every time I reboot my router.
Also, my older Sonos devices works fine under my current wifi system.