@Jamesrock are you using the IoT SSID for these devices or the main network with the blended 2.4/5GHz signal? Also, when you installed the Decos did you set it up with the old wifi name to save time?...

@jamzeze I think to answer this you would need to explain how the wall-sockets are linked together. Do they all go to a central switch somewhere? Are there multiple switches? Can you sketch a quick...

@PZXI 1.2.5 is your firmware version, I'm asking about your hardware version as there are different models for different regions and other various reasons. You can see this on the base of the units...

@PZXI what hardware version do you have? Your firmware might be out of date and an update could maybe fix this issue. If it's too old you might not be able to update it via the app and you'll need to...

@Fl1nst0ne yup, I have the XE75 V1 and the upgrade went smoothly. No new bugs or glitches that I can find yet!

@Red_Nation if you have an FTTP connection and a standard ethernet cable between the "box in the wall" and the Sky router you might be able to remove it completely and just plug the Deco straight...