Best answer by Ken_Griffiths
If all is well with your connection, then check your network setup and cabling to your speakers. Look in particular at any switches, access points, power-line adapters etc; that may form part of your wired network.
If problems persist, then you should Submit a Sonos System Diagnostic for further investigation and contact Sonos Customer Care directly, using this link below:
Contact Sonos Customer Care/Twitter (24/7) etc.
Anyhow I hope that helps and that you get your issues resolved soon.?