I have not seen that behaviour but I have a few thories as to why it could be happening.
1 - integrated MS cloud services, this also affects win8.1 which I had to fix on my PC, e.g. when saving documents the explorer process showing the save as windows would hang indefinitely, I solved it by disabling onedrive in policy editor.
2 - phone home services, this shouldnt hang the OS but windows 10 is constantly calling back to HQ, there is a slight chance I guess this may have malfunctioned on your machine.
3 - The auto wifi search feature, windows 10 will automatically try to connect to other wifi connections if the one it uses is dropped by default.
4 - windows update, again fully automated in win10.
These are only guess's as I have not experienced your problem except #1 but #1 doesnt hang the OS, it just hangs the save as window.