After about 75 flights on my Seagull Edge without a scratch, I dinged it. On approach, perhaps 20 feet in the air and close to the end of the runway, I suddenly got hit-- I dont know from what. My elevators went instantly down and before I could regain control, hit the sand at the end of the runway, and then bounced up onto the runway proper. The landing gear splayed out on each side until the plane was inches off the ground. The gear is aluminum, so it must have absorbed a lot of energy to bend like that, because I cant bend them by hand, or with a pair of pliers. Inspection revealed a dirty cowling and underside of the fuselage, but not one crack or former bent or broken. I had a friend with a vise straighten the gear, cleaned up the plane, put the gear back on, and it is as good as new. What a great value and design!!! Now, what caused the glitch is scaring me. Cell phone? What can cause a glitch like that?