Illustrator 26.3.1 loses Libraries after computer wakes from sleep
Using Illustrator 26.3.1 , if you have your illustrator open and set your computer to sleep, the next time you wake it up and try resuming your work, libraries will be blank and say "Install Creative Cloud Library". If you restart Illustrator, it works fine until the next time you sleep your computer. Version 26.2.1 does not have this problem.
This problem still persists with Adobe Illustrator 26.4
I was contacted by Adobe about this and they said they can replicate the issue on their side, and it will be resolved in the next update they make.
sixes nines commented
I am also having this same issue. Only happens with illustrator for some reason, same version (26.3.1). Put computer to sleep, and on wake up, the library is disconnected, and it only works again after you restart the program.