Sonos does not recommend using any wireless range extenders, whatever brand that maybe, but I guess there’s always some that will/won’t work, but range extenders are mentioned in the Sonos System Requirements:

https://support.sonos.com/s/article/126

However, let’s get back to discussing the router… I did a search of this forum for the model number AC2700 and didn’t find anything untoward. I would however, as perhaps with any router, not enable parental controls, Airtime Fairness or QoS and ensure to not adjust any WiFi security settings, or features, so that its spec. then fell outside the Sonos System Requirements, particularly for some older Sonos products. I think in that case the Netgear router would be fine. It’s certainly not on the incompatible hardware list and if you can do away with the wireless extender, if it continues to cause issues, or better still, simply backlist the Sonos products from using it (and their controller device) then that’s perhaps the way to move forward.