My bird exhibited some strange behavior tonight. I haven't been able to fly for a little over a week so the plan was to fly today. Tomorrow will be rainy here. Got up today and got saddled straight with honey-dos. Including a trip to a neighboring town, Lowes and wife and daughter had to hit a couple of stores. By the time we got home and chores finished there was no more light left to fly. So I decided I would do a quick ground station flight. I setup about 1500 meter total length flight at 250 feet, we have some tall trees here and at night the branches are not easily visible. Got her up, hit go and she went off. With the light mod I have on her she was easily visible through the trees as I watched her go about the flight. It was windy but she didn't have any problem. 3 waypoints later she came back to me and hovered 250 feet above my head. The wind was starting to pick up so I brought her down and set her down not far from me. It's going to be another week before we can fly again so I was going to let her sit there and idle to burn off some battery. I was at 72% still. While she sat on the ground idling I switched to the GS view in app to see the waypoints. I don't know what the props turn at idle but they are pretty quiet. I heard the props increase in rpm which got my attention. The rpm increase was not enough for flight and it was steady after. I watched her for a minute and then went back to what I was doing. I heard the rpm increase again. Where you going? The props increased rpm to lift off about 4 inches. I quickly double checked I hadn't inadvertently put control input into the stick. There was no control input from the remote. The rpm increased a little more and the bird started drifting rearward. Oh No! You are grounded. Reaction took over and instead of lifting her up to about 6 feet I pushed left stick down. Wrong move when the bird is about 4 inches drifting rearward quick down is not the right move. She hit the skids and fell backward eating up her props on the pavement. I have new props coming. I am going to recalibrate my remote before the next flight. She has never behaved this way before. She has sit on the ground with the props idling several times without incident. My best guess is the remote has gotten out of calibration so the throttle stick seeps up. If that makes since. Any ideas?