I would open it up, TAKE GOOD PICTURES, heck, even a short video of everything, if it turns out to be what kenfain said, a pin, or keeper, $5-10 fix possibly.
Order a new one if you want, install it,, off you go.
Sorry to hear that, we were hoping for a simple fix. Hopefully there's parts available for your model. Being a 2015, you should be okay.
I hope you'll consider documenting this process. Then sharing it with us, along with a few pictures. Aside from the obvious entertainment value. It also helps to create permanent, searchable data for others who face that same situation in the future.
Just think about how helpful your own search would've been. If you'd have found the cause, and the fix, already documented!
If you run into problems along the way. We'll be here to try to help any way we can. Good luck!