Model 10 locked up with squibs. Gun range reloads.
Colt police positive 32-20 with a squib. mine.
Model 29 locked up. Not sure why. Range rental.
Model 15 locked up from loose ejector rod.
Rossi with a bad spring.
Come to think of it, I've never had a semi-auto rendered inoperable at the range. I've had some malfunctions, but never anything where I had to pack up the gun and take it home.