While it is connected to the router, submit a system diagnostic , and call Sonos Support to discuss it. 

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 phone folks, they have tools at their disposal that will allow them to give you advice specific to your Sonos system and network.

I did as advised and contacted Sonos support.  After getting by the Bot I was connected to Eduardo M. Very helpful and knowledgeable.  After reviewing the diagnostic he determined that the wireless card was faulty.  Sonos are providing a replacement FOC under warranty.  So nice to deal with a proper company.  Sure the equipment is expensive but the support is fantastic.  Pity some other businesses can't learn from this.  Once again thank you.