I have a Sonos system with 5 speakers. 3 of these speakers disappeared from my application and I cannot connect to them.I performed all possible operations correctly, i.e. I reset and returned to factory settings, updated the sonos application, reset the router, During the process of adding a product, a message appears that the speaker has been added but may not be visible in the application. The speaker cannot connect to the Wi-Fi network. The other 2 speakers are visible and working properly. What else can I do ?