I have never had an issue with the base plate screws on my NXT-ATSE's I wax my board every 3 outings so I'm always loosening them to wax and they have always been tight.
I did have a buckle strap loosen up but it was a fast fix at the base of the hill.
Glad you didn't loose the binding while you were riding. That could have hurt bad depending where you were at the time.
I hope you didn't loose the faith in them....
-I'm Slyder and I suffer from "Gummer Syndrome"