We also have a 31.5 RLTS. A 2011 model. Its had other issues but nothing wrong with the cabinet doors Check where the latch on the door meets the receiver. Sometimes they are not properly aligned. Had one in the bathroom that needed to be moved.
We have a 31.5 FBHS. Never have a problem with the door coming open in transit. Only problem we have encountered is the door latch working loose and the retaining screws stripping out in the "wood".