Just checked, it only does it on one cylinder. I can still see light through the entire cylinder gap when the trigger is bound up. The cylinder appears to be locked up correctly and rotating it by hand reveals no noticeable play when it's locked up, cylinder won't move front to back much either. Releasing the trigger and pulling again rotates the cylinder around and it works fine until that cylinder comes around again and it may or may not hang again. It's not 100% of the time but it seems to occur 40%-70% (it's very inconsistent, it may do it 2-3 times in a row then not do it 8-10 times, then on/off a few times) or so and it's only the one cylinder.
ETA: Same cylinder did it twice when thumb cocking the hammer. I've never shot it SA so I didn't even notice that.