The issue is the entire weight of the door rests on one small, cheap screw at the top of the vertical shower frame. My 28' 2012 Intl CCD had this issue, and I fully expect the same thing to happen to my '15 30' Classic. It's just a matter of time. There are plenty of posts on this problem, and there are various ways to "fix" the problem. My solution was to rip the whole shower door out on my 28 and replace it with a Kohler pivot point shower instead. It was about $150 as I recall, and a PITA to swap out. Just not a good design, and Airstream doesn't seem willing to do anything permanent about it.
"SilverLeaf II" 2015 30' Classic
2014 RAM 2500 Laramie 4x4 CC w/6.7L Cummins
WBCCI # 3430-Unit 21