Troubleshoot wireless setup which cuts / skips with Spotify?

Hi there,

As many as other users, I’m experiencing audio issues with my Sonos system. I use it only with Spotify. I don’t have any local media library and other services. The songs skip or stop but counter still playing in the app. I can happen 3 times in 10 minutes but can be also stable for a whole day.
I know there is an issue with Spotify but I would like to be sure it’s not wireless interference.
I’m pretty sure it’s not but I’d would like to have no doubts. 
I called the customer support few weeks ago (before finding the Spotify thread I mentioned earlier) I have been told that my wireless setup could be the issue because I’m using the same network on both bands and I have several access points. My wireless setup is based on Ubiquiti APs. 
All the Sonos speakers are wireless (3 Sonos One SL, 1 Move).
All the APs are wired. The UniFi controller reports that all the sonos products are connected to the 5 Ghz  (except the Move which is weird because it’s as the same distance from the AP than one of the One SL). The WiFi experience is 100% for all of them. I’ve also used my laptop at each location to see if I was experience packet loss. I was not. 

Is there any utility, logs I can use to find if one of the Sonos products is experiencing connectivity issues that the UniFi controller would not show. 
One more thing I would like to understand? Do the Sonos products need to connect to each other or only the main one? What’s the SonosNet for ? Is it in use if all the products see the router perfectly? 

Thank you in advance.