Good night, already after a few made the first flight had problem with my drone. After updating the firmware to 1.1.9 and then calibrating the command and the drone before flying drone had a serious calibration problem. Got up normally, he behaved well the first few seconds and then gave calibration error, began to race alone and lost sight of him and walked away from me without my knowing where he was. In the display the GPS mode disappeared and was in ATTI and OPTI modes simultaneously. Luckily he did not hit anything and then after a few minutes, miraculously returned to the point Home. I now try it to see if everything was ok but now always gives me this error and calibration modes are simultaneously and the drone loses stability and simply falls to the side. Does anyone know how I can solve this serious problem?