@Robyn Alford Sometimes, Adobe Creative Cloud will often deactivate fonts that haven't been used in a while to free up resources. Which is a great thing to be honest with you. The people who created their fonts, sometimes a font's license expires or its terms change, CC may deactivate it. If a font file becomes corrupted or damaged, Adobe CC may automatically deactivate it to prevent issues.
Honestly, I typically use a font manager and install the fonts locally to my computer. This will prevent the off-loading of fonts too!