Sorry yes the scans are positive scans. So there is a white fog on the frame edges negatives that seems to indicate either not getting light or not getting development. As the film edges are developed that leaves me looking at in-camera problems.

I opened the shutter and looked inside the camera and I really can't see any problems. It looks great in there, nothing appears to be blocking the frame.

The two times it has happened have been with a very cold camera. So I'm racking my brain to think what could be happening, maybe sticking shutter or loose film or...?