It's possible, but after fixing lots of these, my experience says usually talking about stuff like clicking a button before a modal animates out of the way.

It's sort if a "bug" in that yes, clicking here and then here 1ms later doesn't do do the best thing, but it's basically irrelevant.

Testing is inherently a probabilistic endeavor.

"What can I do that is most likely to prevent the largest amount of bugginess?"

Fixing tests that rarely fail is -- in my experience -- a poor answer to such a question.