@dfischer I have done more testing and cannot figure out what is happening. If I set up the Deco with the ethernet cable to the shop plugged into one of the two bottom ports on the Deco, AND if I...

I have a Deco X55 system working in my house. No problems. It is set up totally wireless with no ethernet backhaul. I have a shop building about 300' away and I have a wireless network inside the...