"One minute it crashed"
I think it may be possible that the tub ended up hitting the door lock mechanism and its possible that it may have knocked the wire going to the door lock, out, deactivating the locking part causing the door to open up with the movement of the tub.
Or, the door lock may have broken from the impact of the shaking and hitting.
I know on one load in our WP Duet, we were washing jeans and the unit went into the spin and the tub began hitting the DOOR to the point where the door was shaking and the machine began sliding to the right, but I stopped it right away.
Usually when the tubs on any FL (specifically newer ones with balancing rings) initially go into spin, is when there is the most movement and shaking as the balls in the balancing rings are quickly arranging themselves to counter the load. This usually lasts for 1-15 seconds.
I doubt the actual latch broke as i see SQ using steel latches.
What was being washed when it did this?