Have you tried restarting your router and your iPhone?

You can also try resetting the app and reconnecting to your system.

For several months I've experienced multiple connection issues. Most of the time the 5 devices don't connect to any devices. I've restarted my phone (Android) and it may connect. Please don't ask me to reboot my router, I have 20 devices with no issues. This is most likely an app issue. I found articles online from ZDnet that indicated there was a bad upgrade to the Sonos app. When will this problem be addressed.  I have a lot invested in this system and I'd like it to work without problems. 

Regards,

Gary Lloyd

Sorry, I only agree with the ZDNet article in terms of when the new Sonos software  was originally released, there have been ongoing improvements since that point. 

I’m afraid it is much more likely duplicate IP addresses being handed to your Sonos devices by your router. If you’re unwilling to ‘fix’ this by a router reboot, you can, more laboriously, set up reserved IP addresses for your Sonos in your router’s DHCP table. Check your router’s manual on how to do this process, it seems as each router does it slightly differently than another.
 

This is unfortunately a condition caused by the router, and exacerbated by Sonos, as Sonos, every time you update the speaker’s software (not the controller itself), it asks your router for a new IP address. If your router is ‘lost’ in its DHCP table (caused, I suspect, by a power surge, but I am guessing, I’m not overly familiar with each router), it can hand the Sonos a duplicate IP address, which is being used by another device. While most devices don’t require a constant connection, unlike Sonos, this may be less of an issue for them, especially as they don’t usually ask for new IP addresses. 

Or,  it could be something much easier to deal with, such as wifi interference . Note that all interference may not come from ‘inside’, I have had experiences from errant microwaves, as well as new neighbors setting up their network, which interfered with my own.

However, if you think there may be something else going on, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.