Canvas brightness randomly shifting

Recently, every time I open a Photoshop file, the brightness of the canvas shifts up and down at random times. This is most prevalent when I open two files and rapidly switch between them, where you’ll see the brightness change a second after the file is opened. The only way I’ve managed to fix this issue is by turning off the graphics processor, which isn’t viable as this gets rid of useful features like scrubby zoom. 
 

Let me know if you’re having this issue as well.