Hi @Joniwince
Welcome to the Sonos Community!
I’m inclined to side with @controlav on this one:
- Put your current router in the trash. Any router that dumps every device for any reasons doesn’t deserve to be on anyone’s network.
- Get a decent router, use the same SSID/pwd as before for easy replacement.
Before doing so, however, I recommend you get in touch with our technical support team, who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports - it’s free, which costs less than a router so is always worth trying first. Before calling, please submit a support diagnostic in that 30 minute period after playing music but before the problem manifests. Submit another - if you can - after devices drop off the network too.
I hope this helps.
"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein