typefaces suddenly missing

Several different fonts are suddenly not working on my computer. 

I have been using these documents and their templates for 4 years and suddenly they are considered "Missing" even when I'm looking right at them.

It does not allow me to directly assign it to any other font as well. 

Yes, I have restarted InDesign, my computer, and Creative Cloud. I have updated everything, even my OS. 

When I sign out of CC and then back in, the font issue will stop momentarily. In my font book, these fonts have duplicates. Resolving the duplicates is also a temporary fix.

I am out of ideas. Please help.