Rather than restart the router, have you tried restarting (not resetting) your Sonos devices? Are you using allocated ip addresses for them - this has helped many folk with their systems, so it’s worth doing so. WiFi environments change - new electronic equipment in your or your neighbours’ homes: try running on a different channel. 

Thanks very much for your reply. I shall try and reconnect one of my Sonos speakers by holding down the top button simultaneously with either the + or - button and see if this works.

That would be a reset of the speakers, precisely what is not recommended. 

There’s so much mis-communication in this thread that it boggles the mind. 🤪

To ​@Ewoodforever 

What do you mean by switch on your Sonos? Sonos has no switch it’s always on. When not in use it goes into a low power state.

To be clear…to restart a Sonos speaker or entire system means to unplug/disconnect from power. DO NOT PRESS AND HOLD ANY BUTTONS as that is called a Factory Reset which is what you don’t want to do. In fact you may make matters worse.

Please provide more information about your network. Is a router and modem or Mesh setup. Do you have range extenders in your network? Have you updated your device and the Sonos app? Is your device running iOS or Android?

After you provide some or all requested we can be more direct and stop guessing and/or asking more questions than necessary.

BTW… constantly restarting your router is probably creating duplicate IP Address for Sonos. Also Sonos as a WiFi product is more complicated than your other devices so don’t compare their single link connection to Sonos which makes multiple connections to your network.

Here’s how to reboot SONOS products. Don’t Factory Reset SONOS products without further consult. As you have discovered Factory Reset rarely resolves fundamental issues, but it may temporarily work around something.

People jump to the conclusion that their network is “perfect” if they can display web pages, watch a movie, and send email. These are very simple network tasks. SONOS requires more robust network support because all of the players and controllers are constantly chatting. Default router settings sometimes don’t support this very well.

 If you describe your SONOS system and network (give mfr/model numbers) someone here may be able to help. You can also work with SONOS phone support.

What I mean when I say I I switch on my Sinos is that I actually press the mute button on my Play 5 speaker in the kitchen.

My wi-fi is provided by a cable network and thus I have a router that provides connectivity to various items that we use throughout our house. That includes a Sonos soundbar, x2 Play 1 speakers and a Play 5 speaker.

It’s strange that when I open my Sonos app on my iPad it occasionally is just a blank grey flashing screen that I see, not the usual Sonos app screen which lets me select ‘My Sonos’, ‘Rooms’ etc etc.

I suggest that you work with SONOS support. We don’t have enough information from you to offer any practical help.

In the interim DO NOT Factory Reset your SONOS devices.

​@Ewoodforever 

Thanks for the information. After re-reading your post one other thing stands out that I overlooked….

You said:

• “Just recently, every day when I try to switch on my Sonos sound system it doesn’t work”.

The key words being those in bold. Recently covers several possibiliites such as:

1. ISP pushed changes/updates to your system
2. iPad iOS needs updating 
3. Sonos OS needs updating 
4. New device(s) added to your network that create WiFi interference

Here’s what you can do:

• Contact your ISP regarding #1 to see if changes/updates were pushed out and if so inform then of the issues that you are having with Sonos
• You can check/resolve items #2 and #3 yourself
• If #4 is a possibility; then  remove the device(s) to see if the issues cease

If none of the above applies I recommend you run a diagnostic, make note of the reference ID and contact Sonos phone support as suggested by ​@buzz 

I came here hoping to find solutions to this wreck of an app/system. I am having the same issues with my Sonos. Throughout the day it will just shut down and lose all connections with my speakers. I then have to reboot the router for it to find my speakers. This is an issue that just arose over this past weekend (actually Superbowl Sunday with a crowd at the house). I have no idea how you can degrade an app and system to pure junk.

I find it silly to have to run around rebooting the 15 or so speakers I have bought (some in some rather high places) just to have to do it again within 4 hours. There is an issue with Sonos, not my internet. Anyone else have this issue with a remedy by chance? 

Were the crowd connecting to your WiFi?

This is a very similar up issue to what I’m experiencing. For no reason it just shuts down, so I reboot my router and all is good again.

Humans are essentially bags of water. Water absorbs WiFi energy. It’s likely that your Super Bowl gaggle of water bags absorbed too much WiFi energy. Simple web browsing and email are not very stressful for the WiFi and delays of many milliseconds are not an issue and are usually not noticed. SONOS units are very chatty with each other and there will be sonic and control issues if the WiFi is slow.

Other users have had issues with crowds. A classic is a wedding. The user will bring in a few SONOS units and test the configuration in advance. Everything works well until the space is filled with water bags. Dealing with this may not be too difficult. Better placement of the WiFi access points and SONOS wireless players helps the wedding. Access points and, when practical, wireless SONOS players should be placed above the crowd. And, use good discipline when configuring the network.

I strongly suggest avoiding Factory Rest when dealing with this issue. This will waste time and not resolve the fundamental issue.