I had the right side panel on my '07 come off. Same deal; the little plastic hinges broke off and the wind took it off, tearing it off those dzus things. I was on an empty road, so I was able to find it to kind of diagnose what happened. FWIW, that movable panel is one of the biggest piece of **** marketing gimmicks ever put on a motorcycle.
I took my bike to my dealer and they warrantied the part. I wanna say they ordered both sides because they were afraid the left one was capable of breaking too, but now I don't remember. When I got it home with the new panels, I took them off and put lithium grease on the hinges so they release from the metal clips easier. It's been a lot of miles now, and I haven't lost another one. I'm thinking mine may have gotten "popped" on there at assembly, and the hinge cracked. A few thousand miles of vibration, wind, and removal/replacement at service intervals caused the part to fail.
Take it back...It should definitely be warrantied.