For years I have used powerline connections in my home. I have never had any problems.
I have 2 DHP-308AVs and a 311 with WAP.
On Tuesday an engineer from Sky came out and replaced our Sky TV box. After he left we began to experience issues with our powerline unit behind the TV. The most common issue is that the homeplug LED flashes red indicating a poor connection. Occasionally it disconnects completely. All other devices in the house are fine.
Here's what I've tested
Moved the unit to the second socket in the same unit. No change.
Swapped the box behind the TV with a spare. Same issue. The one behind the TV flashes.
Swapped the unit I got from behind the TV with the one at the router. Same issue. The one behind the TV flashes.
Brought the 311 from upstairs and plugged it in behind the TV. It flashes.
Turned off the new Sky box. It's new after all. Same issue.
Unplugged everything behind the TV except the powerline to remove interference. Same issue.
Switched off everything on the same circuit. Same issue.
Disconnected the LNB cables from the Sky. They're new also and go into the wall 4 inches from the affected plug socket. Although the cables were passed through the existing hole so no chance he drilled through the power cable. Same issue.
Plugged in the 311 in the socket 6 feet away. Same issue. It cannot be a range issue.
Moved the 311 into other sockets in the house. No issue.
Plugged an extension cable into the socket and plugged the devices into that. Same issue.
The only thing I can think of now is that, for some strange reason, the 2 gang socket behind my TV has, after years of supporting homeplug perfectly, has gone bad.
I've done as much as I can think of.
Any ideas please. It's driving me mad and, without homeplug I have no Netflix or PS4.