I had a similar problem my own computer. Connection vdsl 100\50M
Answer caused by windows update, and specific KB3022345 KB3068708 updates.
Uninstall those 2 updates
You can test own computer driving admin rights>cmd.exe SFC /scannow
Sfc without uninstall those two updates says cant fix computer..
You can google that update problem.
My computer works now as fresh install. i hoped that help you