It happens completely at random; today I was using it for about two hours, closed it to let some files sync with my google drive for about an hour, and when I went to reopen it, it's completely removed off of my computer. I didn't restart the computer or anything; it's so confusing! I don't have this problem with Lightroom or Creative Cloud itself.
Any way to prevent this from happening? I know the program just updated about a week or two ago.