sonos products dropping off wifi network

Sounds like network issues. I’m not surprised the Sub is staying connected, it is actually connected to the Era 300, and only receiving a proxy IP address from the router.

Try unplugging all Sonos devices from power. Then reboot your Google mesh router (and pucks, if there are any). Wait two minutes, then plug back in your Sonos devices. Wait another two minutes, they should all be showing in your controller, and you should be able to do any test you want.

Remember, Sonos has a network FAQ here, but if you run into any issues, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

Agree with Airgetlam's points on power cycling order. A few more things worth checking given multiple devices are affected simultaneously rather than just one:

If this started after a router firmware update or ISP change, check whether your router's DHCP lease time got reset shorter than before — Sonos devices renewing leases too frequently can look like random dropouts.

Also worth checking if your router has any band steering or mesh roaming aggressiveness setting. Sonos speakers using S2 can be sensitive to aggressive band-switching on dual-band routers, which shows up as exactly this kind of intermittent WiFi drop across multiple speakers at once rather than a single device issue.

Running the diagnostic Airgetlam mentioned is the right first step — but if you see your router logs showing repeated deauth events around the same timestamps as the dropouts, that points to a router-side roaming/steering setting rather than a Sonos hardware issue.

Separately, if you're trying to work out signal coverage math for repositioning speakers afterward, this free step-by-step calculator is handy for that kind of square footage and coverage percentage calculation.