I understand that this is a serious issue for you. It's just we have never heard of this issue before so we have no solution It isn't logical that it would be a hardware issue. I mention that there are known issues with Logitech drivers but that doesn't quite fit your issue either. Some sort of virus perhaps or Malware? There are programs out there that allow you to customize which keys do what. So somehow something has reprogramed your key to do what it is doing. You might look in the Microsoft accessories or Ease of access perhaps something in those programs changed something? that just a wild shot in the dark
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro