That’s extremely frustrating. However, there has not been any posts that I can find that updating the app was mandatory to continue using the Sonos One nor any that have indicated that updating ruin their speaker.

So the question I gave did you run a diagnostic and speak with Sonos Tech Support as Sonos Customer Service doesn’t have the ability to analyze issues with Sonos products.

Please answer the question as I and other members may be able to assist.

I went through the app and straight away and was on to tech support. I followed their instructions and therin was the problem.  I went away Friday lunchtime and the speaker was working perfectly.  Got home Sunday and it required an update as wasn't responding and I had to go into the app to see an update was required.  It all went wrong from there and as it was no longer in warranty I was told it couldn't be fixed, must be a hardwear issue not a software thing (despite the fact it had worked perfectly well up until requiring a software update).

OK… I suppose there’s nothing we in the community can do to assist. However, 40% off a new speaker is more than any merchant I know of will offer to replace an out of warranty speaker. As for Bose I find that difficult to believe that they would replace an out of warranty speaker that was covered under the standard warranty unless one has an extended warranty. Even those (extended warranty’s) expire. However, good luck to resolve your issue to your satisfaction. 😊