This may be a long shot, but are you running any BitTorrent applications (i.e. to download relatively large files) on your laptop? They will hog all the bandwidth on a home network unless you configure the priorities or bandwidth allocations within the program itself.
I ran into this myself and BitTorrent was the culprit, but if you don't know what that is then the problem lies somewhere else.
$0.02
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Trust your hang.
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