Hi Ronery -
When you download a file, or load a new (big) page, what happens? (You've already told us that YouTube videos "freeze" the video part but the audio continues.) Can you do anything with the browser or the OS while KM is "frozen"? For example, change to a new tab, change to a different app?
And does this behaviour happen only with certain sites, or just all the time? For example, if you went to http://www.abc.net
and looked at their videos, would KM freeze?
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Television is the first truly democratic culture -- the first culture available to everyone and entirely governed by what the people want. The most terrifying thing is what people do want. [Clive Barnes, 1969]