Just registered here on the forums to give my two cents on the matter as well.
Got my Trophy ER this spring, and a few days ago the flap would no longer bounce out or back in when pushed. With a few gentle punches and cycling the central locking I was able to get the flap to pop out on its own.
It seems that the receiving end of the pin, i.e. the mechanism inside the charge port has come loose or unscrewed from its mount. I could feel the whole mechanism move inside the housing when pronging it from the outside.
I'm lucky to have a pretty great dealer, so they'll take it in on Friday to inspect whether the pin has just come undone from its mount or whether they'll need to order a replacement part, within warranty of course. For that they'll need to take off the boot liner and covers, so shouldn't be an impossible task even if done by someone themselves.