I understand how frustrating that can be. Have you tried clearing the catch partition? Here is a link with instructions. Wipe cache partition: Samsung Galaxy S20 Ultra 5G Please let me know if this helps.
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It turned out to be one of my bixby routines was causing the glitches. My solution to stop the problem was to delete all the routines and start over. I couldn't pinpoint the actual one that was causing it.
