@countrypaul I agree, and this is something I did the first time I lost the internet connection a couple of weeks ago as it was the first time in nearly 3 years that the internet connection was lost and all 3 deco units were showing a red solid light (it should be green).
Because it was the first issue I'd had using my current configuration, and simply rebooting the equipment (Deco's and BT Hub) didn't work, I connected a laptop directly to the BT Hub, which requires me to set a static IP address using the correct subnet range, so not as simply as plugging in an ethernet cable, but not an issue for me. The laptop did connect to the Internet without issue. After that test, rebooting everything seemed to get it all working again. Not sure why the earlier reboots didn't have the desired affect.
I've since read that the best way to "fix" the issue is to turn off the main deco unit while rebooting the BT hub, then when it has it's internet connection, re-power the main deco unit. That has worked first time with the last 3 disconnections, but it does require me to reboot the BT hub, not just the main deco.
I also have to reboot the other two decos as they seem to lose information about being wired and so start to communicate with the main deco via wifi. It may be if I left them long enough, they would sort themselves out, but while I'm rebooting, I prefer to get them working properly as my main desktop is connected through one of the downstairs deco units, so when this is wifi, the connection isn't as good.
I definitely haven't ruled out the possibility these issues are being caused by the deco units and have a list of things to try if/when the internet connection is next lost again, although I'm now upto 4 days without an issue!
If it does happen again, I plan to connect my laptop direclty to the BT hub without first rebooting it. The problem is, if the BT hub is "briefly" losing the internet connection, which then affects the deco units and they start reporting it, by the time I get to the BT hub, it may be back on line!
When the BT engineer visited at the weekend to test the internet at the master BT socket he disconnected the BT Hub. I was expecting to have to reboot the deco units when it was re-connected, but to my surprise everything continue to work perfectly when the hub was plugged back into the BT socket! It seems to me, this is how a "temporary" interruption to the internet should be handled by the equipment, suggesting the disconnects I'm getting are caused by hardware; either the BT hub or the main deco unit that is connected to the BT hub.
