The only constant is that with the later drivers installs, it crashes VERY frequently, so I would expect to be able to reproduce the issue pretty easily if needed. Sometimes I have been working in an app, other times I have just been looking at the desktop at the time of a crash. On other occasions I have been able to use the system (including WiFi and Bluetooth via the card) for a few minutes, but not much longer that that before encountering a crash. I have seen it crash on several occasions before I was even able to complete a Windows login. I am not aware of any specific action that causes the crash. Since doing so I have used the system for quite a few hours over last weekend, and have had no issues - not a single crash. then I experimented and reverted the older 18.50.4.2 version. I followed the Intel Driver Update Utility when it suggested a later version - frequent crashes.
I installed the drivers provided with the card - frequent crashes. The motherboard doesn't have on-board Wi-Fi or Bluetooth, so I purchased and installed a Gigabyte GC-WB867D-I REV 4.2, which is basically an Intel AC 8260 mounted on a PCI express board. Everything was running absolutely perfectly after the build, it's running a brand new install of the latest public build of Windows 10 圆4, and was originally connected via one of the four gigabit Ethernet ports on the motherboard (an ASRock Rack EP2C602-4L/D16, brand new, latest BIOS, etc.). My situation is that this is a PC that I have recently built from components. I am posting this in the hope that Intel can do something about it, and incase others run into the same issue.
I have since manually removed the newer driver and reverted back to an older version (18.50.4.2 built ) which so far (it's been a few hours now) seems to be stable. I have attached a photo of the blue screen. The stop code reported in the blue screen data is ATTEMPTED_WRITE_TO_READONLY_MEMORY. I almost immediately started seeing my Windows 10 system (anniversary edition) crash (Blue Screen) on a regular basis - like every few minutes, and on every occasion the module causing the crash was the Intel WiFi driver (netwtw04.sys V19.1.0.4 from 7/24/16). The new version was PROSet Wireless Software to 19.1.0. Shortly after I installed and configured the new card the Intel Driver Update Utility told me there was updated software, and I downloaded and installed it. I recently installed a Gigabyte PCIe WiFi and Bluetooth card into my PC.
This is more of a bug report than a question, in the hope that someone at Intel reads this and takes action on it.