Hmmm, do you have wi-fi set up on your internet connection for perhaps a laptop around the house? If so, is it secure so that neighbours or passers by can not use it?
Other than that, Windows update can sometimes download a lot of updates at once but not anything that should be considered a sudden huge amount, and if Windows has done that it should be nagging you about it, ie, "updates have been installed, you need to reboot".
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