Experience I think tells me that those who can accept a crash without too much grief, stay with RC airplanes and enjoy the hobby. Those that suffer a lot of grief with a loss of a plane, often move on to something less painful. Man doesn't stay where a lot of pain is suffered, especially when there is an easy choice of doing something else. The rewards of RC are rich however, with great fraternity, enjoyment of flying, building and maintenance and repairs. I hope you stay with it... but do so only if the crashes can be accepted without serious regret.

It sounds very much like mechanical or building failure of some sort. Unless the Quickie 500 has changed from the one that I build twenty five years ago and still have, it has strip ailerons controlled by torsion rods and a single servo. If one of the ailerons pulled out of hinges or something fouled a torsion rod, or a servo gear failed... then it would be disaster.

If it was the maiden, I'd also suspect a warped wing. The Quickie 500 has a fairly fast roll response and any significant warp would be detrimental. Warp can be checked by eying the wing from a position aft of the wing and positioning ones vision so that it is aligned with the bottom plane of the foil and then scanning ones eyes back and forth to the two wing tips. Do the two bottom planes match or are they dissimilar?