I'm having issues with my Sonos system since connecting to a new Wi-Fi network. A lot of the time, the app won't load any of the rooms/speakers and I have to turn Wi-Fi off and on again, close down the app, etc and sometimes this will work, sometimes it won't. 
 

I'm now trying to stream a song via spotify through a play 5, play 1 and a sub. I get half way into the song and each speaker turns off and on intermittently. I'll have the sub only playing base for a few seconds, then maybe the play1 and maybe the play5. Very rarely them all together. Please help me fix my system as I've invested a few thousand pounds now in my system. 
 

update- this only seems to occur when using spotify. Tunein doesn't seem to have any issue