Connection issues - What else can i do?

Good afternoon,

I have a Sonos s1/s2 system that’s playing up. I’m getting various messages on the app such as ‘unable to connect’ or ‘There was a problem checking for updates’. The system will work from time to time with a bit of fiddling about. WiFi in the house is ok with no drop out points, and is ok when I have the issues. 
I can press play on the app, it will show music playing, yet there is none. Then after a few tries, it will work. Then I’m unable to turn the music off. I can sometimes link speakers together, and other times I get the ‘unable to connect’ banner. 
I have tried deleting and reloading the app, rebooting devices, rebooting my wifi (Sky fibre broadband), updating individual speakers, resetting speakers. As I type, I have music playing from a radio station, but am unable to turn it off. I get the message ‘Couldn’t stop content, try again.’ 
I have tried to update the system, but get ‘There was a problem checking for updates’ message.
 

The system is an Arc linked to a s1 Play 3 and a s1 sub, two rooms each with a s1 play in, a s1 Playbar, a s2 Move and a s2 Roam. 
 

Any ideas? Thanks in anticipation. 
 

John.