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Now you need to call SonosSupport directly to discuss it, since they don’t live in this community forum.
When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.
For “new bees”: In prior eras SONOS moderators had asked for users to supply diagnostic numbers in their posts. This position has changed in the last couple years and confirmation numbers are now discouraged -- citing security concerns. In the previous era it was arduous for support or moderators to look up a diagnostic, now it is easy.
Sorry to hear of the issue you’ve been having with your Playbase. There is good news - WiFi is not working on your Playbase because it has been manually disabled. Please open the Sonos app and go to Settings icon » [room with Playbase] » Playbase » Enable WiFi.
For the record, even an ethernet-wired Home Theatre primary (like your Playbase) should keep WiFi enabled due to the Surround speakers and/or Sub needing to use the Playbase’s WiFi card for correct functionality.