It's quite unlikely that my issue is a crumb stuck in the keyboard since I don't eat around my computer and it's in clamshell mode 90% of the time out of my way behind my monitors on my desk. If I had to postulate I would say it's from temperature variations throughout the day causing the plastic to expand and contract and not enough thought going into clearances that take into account the different expansion coefficients of whatever is connecting the keys and switches together. Which would also jive with
@smirking's experience, the more he used it the less of an issue it became as the friction widened some of the clearances in the key allowing it to operate properly.