I did have that issue, it was on the copper model. My husband has a silver model where it's not as pronounced.
I wound up getting a silicone sleeve for mine from Amazon. It was well made and still easy to operate.
My door got better actually when I put a 4.5 ml atomizer on it. something about the added weight to the 510 pin made the door latch more securely than with a small nautilus 2 tank that I started out with. It still wasn't invincible, but it was much better.
My husband just uses his but he's the type of person who can just figure that stuff out and operate it without incident, you know "master over the world of things," LOL although his was better than mine in all fairness.
Good luck, there have been other solutions such as clear nailpolish around the edges to make it "latch" more securely, or like even a piece of electrical tape. I was pretty happy with my sleeve so that's what I used.
Good luck,
Anna