That is quite common, they normally have to distribute larger guests to ensure the restraint reads as closed, and quite often will ask guest to press down on the restraints, (they do normally say they are the most restrictive restraints at the park). It is the only ride I have broken down at towers (3 times so far) and one of the brake downs seems to be based on loading it miss aligned one of the towers when parking (there was a sizable gap in the floor) maitanence came out and I think turned the lifting mechanism on and it realigned, and we were evaced, another time I suspect was restraint sensor, as we had problems requiring it to be opened and closed, and when it started none of the towers dropped, the last one I have no clue what happened. breaking down on it isn't too common, I just enjoy the ride and normally do it 2 - 3 times I am at the park so I probably get on it far more than the average guest.