Unity 2017 hangs up system completely.

I want to say "Good afternoon", but it is not good.

I noticed a strange behaviour in Unity 2017. At first I thought that my computer got the virus but now I'm pretty sure that no.
When Unity starts the build process for iOS or Android after some time Windows Explorer stops working.
This happens particularly often when to switch between target platforms (Android -> iOS).
First, Windows taskbar stops responding, then it is impossible to open the start menu and the programs will continue to work but very strange. Chrome still opens a new tab, but it unable to load a new page.
The system is not alive and is not dead, but to make anything it is impossible. Helps only hard restart with the power button.
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So this is behavior of some viruses, but before writing here I did an experiment - I installed a clean system on the free partition and checked. Unity 5.6 - everything is fine. Unity 2017.1 hangs up.