I have. 5 Sonos One devices around the house.  They suddenly all showed offline.  After trying a number of things, I ended up completely eliminating all devices from Alexa, disabled the Sonos skill, hard reset every Sonos. I confirmed that there were not Sonos devices or groups set up in Alexa.

All of my Sonos devices are back online.  I have linked music services and they all operate. Or rectory through the Sonos app.  HOWEVER, Alexa Voice will not activate on any of the devices.  When I choose the device, then log in to Amazon, it attempts to load voice on the device.  This is where it stops.  I get an error that says “!  There was a Problem”.  
 

help?