There is a bug in Windows 10 that makes graphical elements like text, crosshair or menu art disappear when playing the game. This started occuring after a patch was released to Windows 10 late last year.
A few weeks ago we were able to reproduce the issue one of the companys computers. This helped us track it down to the GPU would reading data before or after the CPU had finished writing it, causing UI to disappear randomly.
With the help of Nvidia we managed to find a way to get around the issue by buffering the UI data for up to 8 frames.
The patch is now live on all stores. Update the game to get access to the fix.