Hi @burmz83
Welcome to the Sonos Community!
Apologies for the lack of reply - as you “replied” to yourself, your topic wasn’t flagged-up as one needing a reply.
This issue seems to be due to an incompatible WiFi extender. If the issue comes back, please switch off your extender, reboot both Sonos devices and when they’re online, turn on your extender again. Things should be fine until Sonos reboots again (like during an update) after which, they may connect to your extender again. Just repeat this process once more.
You could prevent this from happening by changing the broadcast name of your extender to differ from that of your router - if Sonos doesn’t know the extender’s name and password, it can’t log on to the extender. Alternatively, permanently connecting one Sonos device (not the Sub) to your network with ethernet will mean all your Sonos devices will avoid your WiFi (and your extender) and use their own.
Extenders are typically not supported as they don’t relay all network communication types (multicast, broadcast, proxy-DHCP and others).