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I am experiencing exactly the same, also on a superfast optic fibre cable connection and dedicated to the Win 8 PC that I am using to view. I recall watching a channel at the weekend where the Quality was automatically set to "High" (with 4 or 5 bar connection) and a picture to match. But as soon as I try to watch sports, movie or other interesting channels, the Quality is set to "Auto" with a connection of 1 or 2 bars and a fuzzy picture that is really not good enough for watching sport. I have followed the various instructions given in the general advice pages. I cannot update Silverlight because I am (apparently) already running the latest version and in any case, this is automatically updated by Windows Update. In fact, I can get better quality streams elsewhere for much less and will obviously need to review my Sky Go subscription. I can see from various posts that this has been a long term problem and nothing seems to have been done about it.