Windows 10 sports something new for Microsoft operating systems. It allows peer-to-peer sharing of downloaded updates between Windows 10 devices. What this means is that if Microsoft’s update servers go down Windows 10 will automatically search the Internet, find other Windows 10 users who have already downloaded the update then download the update from those users’ machines.
The upside is that you are guaranteed to never miss an update. The downside is that you lose control of when your Internet connection is taken over by the downloading operation.
To modify this behavior [Click] Start , SETTINGS, UPDATE & SECURITY, WINDOWS UPDATE, ADVANCED OPTIONS then [Click] the CHOOSE HOW UPDATES ARE DELIVERED link. You can either turn this feature off entirely or adjust how updates are delivered to and received from other users.