Current set up is a two 1st gen One speakers, a gen one sound bar and a 2nd gen One speaker. Of these speakers the soundbar and one of the 1st gen One speakers get used daily the other 1st gen and 2nd gen One speakers get occasional use. The problem I have is that more often than not when I fire up the app the 2nd gen speaker will be missing from the app and I’ll have to reboot the speaker and app, sometimes multiple times before it reappears. If it’s missing and I try and re-add it via the setup it will start the process but just time out. Once it is added it works absolutely fine for however long we use it. It’s left on permanently.
Wi-Fi setup does have range extenders however apart from warnings that this may cause playback issue when streaming through multiple speakers this has never caused any issues. Warning pops up but playback works perfectly across whatever speakers are selected so feels unlikely to be the issue.