Dell XPS 13 9350 - gap between top and bottom case by power button

I have a Dell XPS 13 9350 that I am pleased with overall. But a few weeks ago I started noticing problems when tilting the screen. The top case comes loose at the right hand corner and lifts up when tilting the screen towards me. It lands on top of the power button, pressing down. This makes it almost impossible to close the lid without accidentally starting the computer.

The problem has progressed and today a gap appears even when I am not tilting the screen - presumably due to its weight pulling it down.

Photos below show tilting the screen towards me and what it looks like in normal use respectively.

I have not dropped the computer, the problems just appeared one day. I'm assuming it's a clip or a loose screw. Unfortunately, my XPS is out of warranty. What are my options?