Sorry to hear about this experience. Would you mind trying to update the GPU drivers by following the steps shared in this help article (https://helpx.adobe.com/x-productkb/multi/update-graphics-driver.html), restarting your computer and then relaunching Illustrator to check if it helps?
If the issue persists, kindly share some more information so we can investigate this further:
The exact version of the OS/Illustrator installed on your computer
System configuration (CPU/GPU/Memory/Display(s) used)
Does Illustrator behave this way when working on a specific file or using a particular tool/feature?