Well cast one vote for "never happened to me". My wife (and me kind of) actually complain that the steps are far too tight to flip in/out. I am fully confident mine will never flip out during travel...at least not until they work themselves loose over time.
'04 GMC Sierra 2500HD, CCSB, D/A, MaxBrake, B&W Companion, Retrax Pro, AR Power Steps
2013 Rockwood 8289WS w/Diamond pkg
1969 Camaro RS/SS Convertible
Dad's old 1968 Empi Imp (recently recovered from under 21 years worth of boxes/dust)