Every time I try to hide the Illustrator app (using the top menu) Illustrator > Hide Illustrator, it hides for a second or two then reappears full screen, I usually have to Hide 2 or 3 times, sometimes up to 6 times.
I can't find anyone having similar issues, I've had this for months and it's a nightmare!
I am sorry to hear about your experience. I would request you to share some more information like:
OS and version of Illustrator?
When did this start happening? Are there any recent changes made to your system? For example, any antivirus, system updates or web extensions installed recently.
Does resetting Illustrator Preferences (https://helpx.adobe.com/in/illustrator/using/setting-preferences.html) help to resolve the issue? Disclaimer: Please note that resetting preferences will remove all the custom settings, and Illustrator will launch with default settings. This way, all your old settings will be saved in .old folders, and Illustrator will recreate new folders with default settings.