Whoa! That is strange. I’m going to give you some ideas… I’m in no way a professional but I’ve seen things like that before related to memory or failing hardware. (husband is an ET)
You can try a few things to see if you can figure out what’s going. on.
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Go into device manager and see if there is any hardware issues. (even new computers break down) Look for memory/video, etc… weird things that aren’t normal.
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Double check to see how many programs run automatically. Turn off the unnecessary ones.
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Check on the latest update for Avast. Roll it back to a previous restore point and see if that brings it back and if it does allow the update again…
Good luck!