I'm flying my Inspire for quite some months and I'm really happy with it. However int the last days I'm getting some problems: After Compass Calibration I usually take off to about 1,8 m height and wait until the landing gear moved up. When I then want to fly to the front the Inspire drifts to the side (at an angel of about 315 degrees). Letting the left stick go back to the middle position the Inspire still drifts a bit to the side. (I can move it back by pushing the left control to the right) but I can not do a controlled flight like that. Now that does not happen always, but I had it in 2 locations several times (one of them far off the next houses / urbanisation) but at the same location I could fly normal before. I fly with GPS mode with the latest firmware release. Does anyone have an idea what could cause that problem and a potential solution to the problem?