Took a couple of rough landings at the Grand Canyon. Actually it took off and landed on a cliff. After a couple hours of climbing different routes to retrieve it I got it. Nervous to try again till I got home in Washington state. Put new props on recal the gps and tried it. It would hover but start to go on its own, never felt I could trust it. Upgraded software today hoping that will take care of it. Will try it this evening when I get home. Any ideas why it would act so irrational?