If you want help and not just to complain to us other users, tell us what you have done so far to restore proper operation and we can likely give you suggestions that will restore your system.

When it “prompted for a required update yesterday“, was it asking or insisting? You can turn off auto updates, meaning you can check for feedback from those that have installed it before deciding whether or not to go for it on your system. 

If you’ve not already done so, it’s worth setting static ip addresses for your Sonos devices, and they are prone to ip addresses conflicts after the update process. A system refresh is also a good idea. 

It was insisting.  

This is a recurring theme with sonos updates (especially when they do firmware updates like they rolled out this week).  I have been going round and round with sonos tech support for years, and each time in the end, its either “sorry nothing we can do”, “have you unplugged and restarted your devices”, or they just ghost. 

As far as my home network goes, I have rebuilt it and used various brands of hardware (I do a lot of this for a living and knowledgeable on these systems). I have done static addresses, dynamic, have made changes to network security and infrastructure to even give it the best shot, and still continue to see these kinds of issues.  

It worked fine (still some issues, but the typical issues we continue to see with sonos) until the update this week.  It is unacceptable to have to troubleshoot and overhaul a network each time that sonos does an update.  

Troubleshooting so far today leads to it being a bug in this update - similar to prior times this issue has cropped up that was then corrected a few days later with a hotfix update. 

I have automatic updates disabled on my iPad and in the SONOS controller. The only time an update is “forced” on me is when I add a product. All products and controllers must use compatible versions. Sometimes I do wish that we could force a version to be installed — within reason. Some of the older units don’t have enough RAM to run the newest versions and (I don’t recall the exact date) the original units were repartitioned in order to support some of the more modern features.

Usually when a bug is pushed out we see a lot more complaints than when it is an individual network issue.

Since you seem to be an expert and have done the usual suggestions I can't be any help.

I am also bricked

my history with lates update & Cust Service/tech support is in the update announcement three.

I copy below

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Well, this “update” with Fab improvements has completely broken my system.
over 8 calls to CS, including individuals who should not be in tech support - I finally had one person who spent over an hour with me, before “escalating” to level 2. (Please note, the total work to ameliorate or address the issue is well over 10 hours at this point - it was just a few hours with the latest support person.)

Of course, no one in level 2 is available.

Yet another update designed specifically to shed customers. 
I have ordered a new speaker pair from a different brand in the hopes of something better.

As for fixes tried:
1) Reboot
2) Rebuild network
3) Call CS, who say’s it’s the Fios Network-
3.1) Spent the morning testing with Fios, all good
3.2) Build subnetwork for IOT
3.3) Build yet another Sonos Network on dedicated IOT network, they are the only devices on this new sub-net
3.4) No improvement, at most one speaker will play, perhaps for up to 45 seconds before dropping out.
4) Try calling again
4.1) Try to update speakers
4.2) Takes over 30 minutes, CS disconnects, Errors thrown are 101 and 30
5) Try calling again
6) A few more calls before getting another helpful tech person
6.1) Multiple diagnostics
6.2) Screen share
6.3) Network questions and pings and speed test
6.4) Try to update speakers  - 
6.5) Update fails after another 30
6.6) Tech tries to read reports on errors (same as earlier)
6.7) Start to move to escalate

So yeah… before you ask if I tried to check the network- 

(And somewhere in there was factory reset, and uninstall and reinstall the app, etc... - I just don’t fully recall in the sequence list, and don’t care to review my testing notes.)
Lets review - system was working before the 8th
System update
System stopped working

AND what ever update did in the firmware, even iPlay doesn’t work on all of the updated speakers.
What ever they did, they bricked my entire system.

Nice job Sonos- I mean heck, I even put up with last years update… but today- while working for over 8 hours with no music or fix, and no tech support available - Amazon purchase has been made for other speakers.

Let’s hope that the accountant team from Sonos that is driving these poor engineering decisions doesn’t jump ship to the other brands.

I have Exactly the same problem with the latest update.

i did the update and the system stopped working properly. I went through all the normal diagnostic, bugs fixed reboot etc.

Now it looks like we’re going through this all over again.

I had thought of Sonos setup a beta testing program to preclude the possibility of these dramatic update failures from reoccurring.

Would it be valuable to you to have individual posts from others, who are not in any beta, and had no difficulty with this last update?

I’m not saying you didn’t have difficulty, but I am suggesting a call to Sonos Support to discuss it. Obviously, there was some issue that you have run in to, but I certainly didn’t, across my 20-some speakers. Giving Sonos hard data in the form of a system diagnostic within 10 minutes of experiencing this problem, and then calling in with that diagnostic might be helpful, so they could pass that ‘hard’ data to the programmers, to help figure out what the issue you’re experiencing is. 

I have Sonos speakers and/or Sonos ports in five separate rooms in my house and I have owned Sonos speakers from when they first came on the market. I’ve been down the road of debugging Sonos problems quite often on my own or with Sonos Support. 

I did call Sonos support On this issue. This time I lucked out and they answered fairly quickly. 

Before I did the update I had no issues. After I did the update there was no joy.. After reviewing with Sonos The problem turned out to be related to some interaction between some of the music streaming services and the Sonos application post update.

The solution involved remove the streaming service completely and then reconnected After removing the Sonos app and restarting it again. A relatively simple fix compared Some previous experiences. I had experience this problem before but I had forgotten the solution. So I went through my repertoire of known fixes I missed this one.

Should I have waited before posting here until after I talked with Sonos; YES.  

Regardless the Sonos application still seems fragile. Whether or not this is Just my perception or reality doesn’t matter. Sonos has a big job in convincing us that they have a product that’s will not throw a curveball every couple of Months.