In that case, the standard answer to any "my live TV is pixellating" query applies!
Reboot your box once to eliminate gremlins, check the status line (0800 5610061) for any known issues, and if you're still drawing a blank, then call it in.
If one reboot has failed to clear symptoms, further reboots won't make a scrap of difference to whatever underlying fault is causing it. Box tuner issue, cabling fault (internal or external), rusty connector, problem in the streetcab, take your pick....
It needs either an engineer visit or box replacement, one of the two.
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Thank you. Virgin insisted after 5 visits that the box was the problem but finally agreed to change the cabling in the box outside and from the box to the house which cured the issue for about 8 months.
This is not a new issue and is eventually sorted .Changing over the box seems to be the usual route that the engineers would like to take ,but ,as in my case I was able to show that the box was not the issue.
As my feed is the first one off the distribution box for the Close I feel that the strength of the signal ( some engineers have said it is too strong) has a part to play