There are a few very large W10 updates.
I've just sat through updating a PC that hadn't been updated for a while and it took over 4 hours.
If you have some large updates waiting, it will do what you are describing.
Turning off the computer before the updates have completed will start them downloading the next time you are online.
Best to let it finish the required updates.
I don't think you can't turn off updates altogether, just pause them and change active hours of your PC, etc.
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