Your downstream power levels are too low. Looking at the way the problem came on suddenly I'd hazard a guess that it is an area equipment fault, and if that's the case they'll hopefully already be working on it. You can check online for a known fault in My Virgin Media and also the separate phone-in fault checker (that phone checking tends to be a bit more accurate than online, for reasons known only to VM).
Or wait here for the forum staff to pick up your post and advise - sometimes that's quick, sometimes a day or two. If none of that cuts the mustard, then you can always try phoning it in as a new fault, and enjoy VM's legendary telephone support.
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VM chap attended yesterday and saw a record of my problem on his grafana reports and he also did say the power limits were a little off but were still within limits. He didn’t like look of the device at the demarc point so he replaced it. He tried to find out what the utilisation is like in my area (07) but his report on that didn’t work, he said that you guys might be able to help on that. But yeah everything seems to be better now.