Lately, my Inspire is almost out of control for about the first 30 seconds of flight, and then it is all OK. I always calibrate the compass (if I have moved locations from the previous flight) and after takeoff, it tends to move mostly backwards for a number of seconds and then all is pretty much OK. I now take off and ascent above tree height very quickly so if it moves off line, I won't hit anything. I also only take off in a very open area so if it moves offline, I am not in trouble. It doesn't always do it, and sometimes when it has, it's been quite windy (beach), so I wondered if it was the wind, but it seems a bit too often now for it not to be a short period of instability. When it does this, it does respond to controller stick movements, so I can move it around, but it appears fairly unstable. I don't know if the display is giving any warnings because I'm too busy watching the aircraft. I'm just wondering if anyone else has this problem, and/or if anyone knows what it is and a remedy.