If you've rebooted and it's still occurring it sounds like a signal and the box will need replacing
First though check it's not a VM fault.
Check the automated faults line on 0800 5610061.for any existing issues in your area that could be the cause:
If nothing is showing there then sign into Check Service status at the top of this page. It shows any local faults, but more importantly you can also run a test against the V6 box. By doing this VM should be able to try and connect to your box and determine what the problem is. Sometimes this results in them sending out a replacement and/or engineer, which saves a phone call.
.If the above doesn't help then you should call 150 from a Virgin landline, or 0345 454 1111, option 2 (Faults) butbest to call between 8am and 10am to avoid call queues, or late afternoon around tea time
When calling Faults hopefully the system will recognise that you've used the online faults checker and place you into a queue for an agent to pick up.
If not and you get the automated response asking you to press 1 for the link to online support etc, ignore all the options and don't press any buttons then you should be placed into a queue and an agent should pick up the phone and resolve the problem.
The Service you do for others is the rent you pay for your room here on Earth - Muhammad Ali
For the benefit of anyone else with the same symptoms... and to reinforce the previous reply....
Pixellated pictures on live TV are often the sign of a signal fault. If you've rebooted your box once, then there's likely a fault somewhere, so call VM and report it. You're likely to need either an engineer visit or a replacement box, depending on what VM's remote diagnostics turn up. They can do these while you're on the phone to them.
If nothing's reported on the area status line, assume your fault is only affecting you and tell VM so they can arrange the next steps.
150 from a VM phone, 0345 4541111 from any other phone - choose the fault options as mentioned.
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I have checked a few things from here with the V6 box and I can see its an issue with the Signal strength coming in to the Box
So to get this fixed
I have booked the first engineer appointment we have available
You can check and reschedule this appointment through your online account if you need to
You can also cancel it if the fault has gone
Can you please let me know how the visit goes