Updates

Why does Avast download various updates at different times during the day, when I am on the internet? My settings indicate that this should happen at 3am.

My settings indicate that this should happen at 3am
what setting is that?

avast look for virus updates (and download if there are any) as soon as the computer have started and connected
then if computer stay on it will check every 240min (default setting)
then you have stream updates…that happens all the time