Reset your PLC adapters Wi-Fi extender if they no longer communicate with each other optimally (i.e. if the dLAN LED that looks like a house is no longer green).
Leave the adapters connected to the electrical power and press the button on the right side for about 20 seconds (until the power LED goes out). Do this for both adapters, in any order.
After the adapters have been reset, they have to be reconfigured. For this, disconnect the cables of the adapters and unplug the adapters from the wall socket.
Plug the 2 adapters into 2 sockets located in the same room if possible (it doesn't matter which room).
Press the button next on the side of one of the adapters (once will do).
Then press the button of the 2nd adapter (also once).
The adapters will now reconfigure.
Once the DLAN LED that looks like a house is lit solid green, the configuration is completed and you can plug in the devices again in their original locations (don't forget to plug in the cable again).
If you have a 3rd or 4th adapter
Plug in the adapter in the same room as one of the other 2 adapters (it doesn't matter which room).
Press the button of the adapter that is already reconfigured (once will do).
Then press the button of the 3rd or 4th adapter (also once).
Wait until the DLAN LED that looks like a house on the 3rd or 4th adapter is lit solid green.
Plug in the adapters again in their original locations and don't forget to plug in the cables again.