Fedora 23 updates causing wasted bandwidth

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HISTORY: I installed Fedora 23 on a spare laptop for my brother. Sent it to him. He uses Verizon wireless Internet through a wifi hot spot. His data bandwidth limit is 12GB / month. He burned through more than 20GB in one month. Pretty expensive for someone on a very limited income.

I couldn't believe it could possibly be Fedora causing the trouble. He swore he never used more than 3GB.

REPLICATE THE PROBLEM: I installed a default workstation Fedora 23 on a Virtual Box virtual machine. Upon first boot I installed nload from root terminal:

sudo -i
dnf install nload
exit

Using nload, I immediately see massive bandwidth usage. The computer should be sitting idle.

TROUBLE-SHOOTING: I suspected that updates were being downloaded. I ran updates to see if the usage would stop once updates were completed:

sudo -i
dnf update
exit

Sure enough, about 720MB of downloads. Once they were completely downloaded, nload shows that there is no activity on the network.

RESULTS: I called my brother and walked him through updating the computer. His machine downloaded ~800MB of updates. His problem ended right there.

Since then he has been using about 30MB per day. He, now, updates manually every day.

This is all fine... except; how did 20GB get used in one month!?

My Theory: Looks like Fedora 23 default workstation is downloading updates in the background and then not saving them upon computer poweroff, possibly causing daily re-downloading of those same 800MB of updates.

I haven't yet tried the suggestions presented in the post: How to turnoff automatc updates in fedora 21?

My questions: I would never have noticed this in-efficiency as I have nearly unlimited download bandwidth.

Does ANYONE have any idea if this is a known Fedora23 problem? Or, where should such a problem be reported?