I had a full hp sea gull and everything I pressed, it did nothing. I used slicing wind, nothing happened during my turn. I used cyclone, nothing happened during my turn. I used hawk eye, nothing happened during my turn. In the meanwhile, the opponent was able to attack me every turn.
I know it is not due to an attack that takes multiple turn, nothing takes 6 turns doing nothing.
I still can't tell exactly what triggers missed turn. It is not button mashing, I used button once. It is not addon, I turned them all off to see if this was reproducable and it is but very rarely.