OK, thanks for that. The "bed" and "door" issues I don't think are material - wireless signals are not heavily attenuated by wood or plasterboard, and if the booster were in the same room, even a metal bed frame wouldn't normally be an issue unless the metal frame were right up against the booster. VM field technicians sometimes don't seem to know a lot about wifi, unfortunately.
This could be wireless, or it could be your VM broadband, so bear with me whilst we check the easy to check stuff first (and my suspicion is more towards the broadband than the wifi, but I could be wrong). I suggest we start off looking at the hub's status data to see if there's a problem there. Connect to the hub by clicking on this link http://192.168.0.1/ That should pull up the log in page for the hub. But don't log in, just click on the link "Check router status" That'll bring up a window with five tabs. All we need is the contents of the three titled Downstream, Upstream, Network log, and if you can post that as text not screenshots it will help. Open the Downstream tab. Select all the text (Ctrl-A if using a keyboard), copy it (Ctrl-C), then paste it (Ctrl-V) into a reply here. Post that, do the same for the Upstream and Network log. You'll get an error message when you post the Network log, just click on "post" a second time.
This may show nothing, but it helps rule out power or hub-recognised noise problems. If all looks good we can move on to a quality check of your broadband connection using a Broadband Quality Monitor. But that will take 24 hours to give us a set of meaningful data, and then you would need to post a link to shared graph in a reply here.
Also, do you know if the socket used by the upstairs booster is on the same circuit as the downstairs unit? They usually work best on the same circuit, and if they aren't you might find performance improves with the booster in the room below where you're working. But that will only help if the problem is the wifi.
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