My iMac shows "sprinkles" then crashes

So, my iMac has been doing something really weird recently and it is concerning me. I will be going about my business, then all of the sudden the screen will go bonkers and my iMac will crash. What happens to the screen varies a bit, but mostly includes something I'm calling sprinkles, unresponsiveness, screen wrapping (where the screen is shifted to one side and "wraps" around to the other), and of course a boring old black screen. I've posted some pictures below.

Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional — ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

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