New wifi router made my Sonos system *** up!

Hi, 

I recently got new wifi router = new wifi. Now my Sonos app work slowly, also my Sonos products (Arc, Roam and 3x One SL) are not working correctly. 

Firstly, only Arc could work - I always airplay music to Arc and then via Sonos app I stream via 'everywhere' button to all other. Now in app it can be shown it is playing music everywhere, but in real it works only in Arc and in One SL. 

But it doesn't play music from all ONE's and Roam at the same time! Always 1 or 2 ONE are problem and sometimes Roam. Roam works only when played alone. But also if I stream via Airplay music to my Roam and spread it to other Sonos in my system via 'everywhere' it just doesn't work. If I connect more than 1 Sonos One I had the wifi extender report. Anyway I also tried unplug all of them and replug, I tried to disconnect and reconnect… I just did anything and still it doesn't work. 

I am desperate because I am addicted to my Sonos system. Please help me.

EDIT.: I disconnected all of my products, disconnected router - waited couple min - pluged in router, waited for wifi to get on, I plugged in all Sonos devices… First I had to manually added Arc to my products, then I had problem with 1 One SL that I had to unplug like 2x to make it appear in my system in the app. I airplayed music to Arc and spread it everywhere and it says in the app music is playing, but the sound is actually working only from Arc. When I disconnected all of them and connected just Arc with just 1 One SL it worked, but if connect 1 more One SL it doesnt work (music will stop in both ONE SL) so basically only Arc + 1 ONE SL work but nothing else. 

Edit no. 2: I also tried to connect music from Arc with Roam - it works only untill I try to add 3rd Sonos. Doesn't matter which Sonos I combine, but if I try to play from more than 2 the music stop everywhere except Arc (from which I spread the music).

Not sure why it can play from 2 Sonos devices only, but it seems at least we found out what is the problem.