I know the feeling, ak! (or I know no-feeling!)
I've got real stiff shoes, and it still happens. I go into the "thinking-about-my-pedaling" mode or click out for a minute and twist my ankles. Mine ususally only happens on my right foot, and I think it's because I'm really right-side dominant.
Thought neither of my feet would ever have any feeling again last weekend after a metric century. SHorter rides are ususally OK. How 'bout you?