Help with Sony Trinitron TV picture please!!?

I used to have basic Sky TV & the picture was fine. I now have Sky+ & since then the picture keeps changing to 4:3 instead of staying 16:9 widescreen. I spoke to Sky who say its a TV fault not theirs. BBC & ITV are ok. Its just a few sky channels where the prob is. When the commercials come on it changes back to... show more I used to have basic Sky TV & the picture was fine. I now have Sky+ & since then the picture keeps changing to 4:3 instead of staying 16:9 widescreen. I spoke to Sky who say its a TV fault not theirs. BBC & ITV are ok. Its just a few sky channels where the prob is. When the commercials come on it changes back to 16:9,then when the programme starts it goes back to 4:3. Any ideas?? The model is KV32HX15U.
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