Photoshop 2018 reboots computer when adjusting curves in curve adjustment layer.

Photoshop 2018 reboots my computer when adjusting curves in curve adjustment layer.  I am on Windows10 and editing a .tif file in order to create an LUT for video.  The first pass worked fine, but when I applied it to my video it seemed a bit milky.  When I went back to Photoshop to  adjust the layer, it rebooted my system.  So, I started Photoshop again, deleted the original curve layer, created a new one, and when I put down the first 2 ajustments it works fine, but when I then try to move the marker closer to the gamma end it  just reboots my system!!!!!  Have done a clean reboot, and tried this on a different tif file.  Have now given up and using Avid's crappy color correction because I cannot get Photoshop to work.