Did you ever hear a whining sound coming from your Quest in flight?
Mine started sounding like a high pitched single note airborne siren. The pitch remained the same regardless of air speed. My first thought was that the louvers in the thin belly pan material were singing.

The next time I took the plane out to fly the whine turned to a loud buzz and the plane went severely out of trim and nearly out of control and when I made an emergency landing the right wing suddenly dropped just before touch down. I managed to get the wing up but made a hard landing. The buzzing continued all the way down to landing speed.

As the photo below shows, the blue trim stripe that runs nearly the full length of the right wing was lifting and causing the noise and unstable flight. The clothes pins are only there to show how the trim is peeling back.
I posted this to point out that loose trim can lead to a really hairy flight.

While I and three other experienced fliers and technical "geniuses" stood there inspecting the plane and coming up with complicated theories for the buzzing, my wife nonchalantly pointed out that the stripe was lifting. I'll bet she thinks she's so smart. Or maybe she can just see better than we can.