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I've been told by ntl CS that broadband dropping connection onece or tiwce a day is nothing unusual

Me thinks they've fobbed me off.
If this has only just started happening, then see if it does the same thing over two or three days. If so, especially if your TV piccy starts to be a tad suspect, call faults. If it's a one off issue, it would go away
NB if you are using any form of router or something between your STB and PC, disconnect that to rule out any problem.