Airport and Sonos bridge issues

Question

My airport base station and Sonos wireless bridge have stopped talking to teach other after many months of happiness together.  I've shut down and rebooted all components.  Still not being friendly. I hardwired the bridge to my iMac and was able to get all Sonos components to be recognized but still can't get anything to play. When I unhooked the Ethernet cable between the bridge and computer, the Sonos controller no longer is able to see a network, register components, etc.

Answer 1

Thanks Steve, but you and others won't believe what the real problem was.... a faulty connection to the router.
For similar dupes like me, here was the story.
Sonos bridge has a light on the top, and of course, when plugged in, it lights up.
Undiscernable to the eye-- when they are not lit up ---  the bridge has lights next to each of the ethernet connections on the back.
because my airport extreme's ethernet port was already in use by the printer, I used an apple adapter to get the sonos bridge connector into another port.  
Sonos support (which is fantastic) asked if the lights on the back were lit. I said "what lights?" "the lights next to the ethernet port" "there are no lights there to light up" "yes there are....they are really really small.  " 
Sure enough, attaching the Sonos to itself with two ends of the same ethernet cable caused the lights to light.
it was then that it was clear that the adaptor was the problem. Groan. I switched the ethernet connection from the extreme to the sonos bridge, and then used the freed up ethernet port to the sonos. No problem.
I suggested to Sonos that maybe they add something about those lights to the user guide.
I want to reinforce how superb the Sonos customer support is.