Wire one of your speakers, if you can't, then get another similar speaker and put it where it can be wired.

While a Boost would work, the replacement for the Bridge, it isn't being sold any longer.

If you tell us more a out your setup we might be able to help, you could also, all Sonos Support. 

Thanks Stanley_4,

I can put one of the speakers on an Ethernet cable to the router. But I also think the issue is with the app. I can get one or two songs off a play list then I get hit with “ song not encrypted” and drop out.

At present I have all four speakers dotted around the house just working off wifi to the router. They all have had a software update. They are at least 15 years old (gen one). Used to have them on constantly as most of my CDs were put on a hard drive and played from a computer via the home network. can’t even access that anymore.

Are you using the S1 version of the app? 

What music service? I don't recall seeing "song not encrypted" as an error message.

i think you get the error like  “song not encoded correctly”, when sonos times out with handshaking, its a house  wifi problem, try an ethernet cable or even moving speakers about nearer to router….