Illustrator 26.3.1 loses Libraries after computer wakes from sleep
Illustrator Version 26.4 and 26.3.1 have an issue where if you wake your computer from hibernation or sleep, the Libraries panel in illustrator will prompt you to install Creative Cloud. This problem doesn't happen in previous versions.
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MT01 commented
https://www.youtube.com/watch?v=MT05ST4PE1o for a detailed example