Intel® SSD 760p Series 2TB has put itself into a read-only state.
Took me a few days to notice, as the drive is used for high-read/low-write purposes. I was having some strange software issues, and assumed they were software bugs. While trying to figure these out I discovered I couldn't create a new directory on the drive, then realized oh, this is a hardware problem.
All data is intact, Windows 10 treats the drive like it's healthy, but no writes go through.
Drive is only a few months old. I guess if something is going to break, better that it breaks soon. ;-D