Best answer by Becoming a sonos Hater
I would like to place this post @ the top of the discussion.
Result: It was a hardware failure in the Playbase (it just happen to fail when software was updated). I had to go through a simple process for Sonos to replace the Playbase. I have now received a brand new or refurbished (can't tell the difference) and all is well and enjoying glorious surround sound again. [The anger arose because we invited friends over for a movie, and the next day I cancelled a friendly tennis game, because I was not going to let the sonos error beat me after the software update] - It would be good to know and I believe would cause copious amounts of less frustration if the Sonos app can let you know if it is a hardware failure. They were able to immediately tell me when I called gave them the diagnostic report number.