As someone suggested try using a wired connection to test. Most people can't have a permanent ethernet cable trailing about but having a 50m cable is handy especially if access to the internet is important.
Was Eclipse Home Option 1 & VM 2Mb
Now O2 standard
The box it runs on isn't a super computer, but it is a new one and runs nothing but this (or whichever internet TV we're watching). I have similar problems, although not quite as frequently, when we're watching the subscription channel tennistv.com. This is almost exclusively live. They do have video replays of matches, but we tend to only watch the live games.
The other site we use regularly and have similar problems with is time4tv.com which shows Sky Sports and other sports channels. I accept that this site is probably the most flaky of them all though.
Have you tried testing various steam qualities from youtube (e.g. 240 v 1080p)?
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