Serafina Large Frame Leather Crossbody Bag

I've bought 2 of the Serafina (one black, one Oxblood) and returned both. The quality, size and opening are amazing! However, the moment I have anything in the purse- no matter how small or light- and I put the strap on my shoulder, it immediately pops open. This happened with both bags, so it wasn't just a fluke. My theory is that the problem arises because of the strap end placements. They're mount one on each side of the kiss lock clasp on the inside. The force of the bag hanging causes gravity to pop it open. If they were on the outside by the hinges, just on the outsides of the bag or even on the same side on the inside, it would be fine. As it stands, the purse is unusable to me, which is a disappointment since I looked forward to buying this bag for months. I own 17 Patricia Nash bags, and this is the only one I've ever had to exchange and ultimately return.