refrigerator door won’t close properly. Have to push it shut and hold it to make sure it doesn’t pop open. Several years ago, had it repaired-think they put a new lower hinge on it. Maybe that’s what’s wrong again or could it be the gasket? Where do you find parts for Sub Zero
I could not find any info on the given model number.
For parts I would call AppliancePartsPros they should be able to help you.
Does sound like a door cam problem.
Most units have a plastic cam on the door and the hinge.
The door actually rides up and down on the cams and when closed is on the down slope so gravity holds the door closed.
Check your hinge for these, odds are one of them is broken.