Loose video when commercial starts

[fuzzweed]

Occasionally when a program goes to a commercial break and the screen blanks for a fraction of a second, the video freezes. The audio keeps playing, but i'm left with a black screen. Exiting to main menu and going back to the program 'unfreezes' it, but then it happens again on the screen blank between the commercial ending and the program starting again.
It seems to be confined to only a few channels (E4 in the UK most notably) and not all the time - but if it happens once in a show, then it will most likely happen again in the next break in that show.
It definately affects live TV, and I think i've seen it happen on a recorded (or maybe timeshifted) show too, although I don't have any recordings to double check this at the moment.
Any thoughts?

[sub]

I'm wondering if that channel does not fix time stamps as it broadcasts, and causes a 'discontinuity' at this point. You'll probably find that using a different decoder will cope with it better.

ie, picture a normally increasing timestamp number while you're watching a show, then the broadcaster splices over to an advert that is using some entirely different timestamp range - some decoders dont cope well with this, and just sit there waiting for the next number they expected.

[fuzzweed]

thanks sub,that makes sense. i`ll have a play with some other decoders and see what happens...