The SONOS experts will say to only have one wired SONOS player and to turn off wifi in all the SONOS players. I can say that in my early SONOS days, I used to plug in every SONOS player I could to ethernet. Some of those systems are still running fine to this day. It might just depend on the network hardware, etc.

But I will say that I also have seen DirecTV network issues that killed entire networks. Usually a reboot of all the DirecTV stuff would fix it. Start there.