I have been facing this issue MS put me on a newer version of Windows 10 to get around the RAID issue they were having with the anniversary update. Now when I am trying to download large work files from the company FTP the computer will randomly lockup and I am forced to do a hard reset to recover it. The files being downloaded are generally in the 2 - 3 gb range though it may also do it with smaller files as well. I did a fresh reinstall thinking it may have been a damaged driver issue however the issue persists. I am at a loss as to what else to try or what might be causing the issue. Any advice on this would be welcomed.