Netgear Nighthawk router Smart Connect option.

Hi.  I don’t have this router but I do have a router with the same facility.  When enabled this feature often causes problems for Sonos, as it sometimes introduces instability.  This may well vary between router manufacturers, so it wil be interesting to see what users’ experiences are.

I note from your profile that you have a Boost.  If you are running SonosNet then your speakers are not connecting to your WiFi anyway, so this setting is almost irrelevant in that case.  (It may affect controller connectivity, but I doubt this would be an issue in practice.)