I am getting sound garbeled on quite a few stations and the picture disappears and comes back a minute or two later, I have another box and swopped them and it was okay , but the box I took off and attached to the other tv was just as garbled and picture disappeard as well, have been trying for 5 days to talk to someone at virgin, but all I get is machines......aaaaaarrrrgggghhhhh !!!!!!
I'm one of the users that was affected by last year's glitch and, like @paperclip, we're hoping it's not returning. I've not seen anything unusual yet, though from your description, it sounds very different from the previous issue.
In our case it was very short duration dropouts in audio only. No effect on picture at all, and audio issues not linked to picture and not predictable. Only affected BBC1 HD.
If there's a separate issue, it may be worth seeing if anyone else is experiencing the same issues, and starting a new thread for anyone affected?