Two suggestions. First, make sure your new router is using the protocols as delineated in the Sonos Network Requirements FAQ. Second, follow the suggestions in the new router - installation instructions FAQ. The thing I’ve found most useful is to wire one of my Sonos units temporarily to the router with an Ethernet cable, which gives me access to most of my speakers, so I can change my network data. For my Roam, I just follow the instructions. I suppose you might go the easy route, and just set up the new router with the same SSID and password. Assuming it’s broadcasting the same protocols, your Sonos would just connect.