Hi, when I lift of with the ALTA 6 I get the accelerometer fail warning. It seems to fly rather normal but it's no condition I'd like to persist or even fly higher than hover-level with. After landing, disconnection of batteries and restart, the same problem and warnings will show at liftoff or some seconds thereafter.. Prior to this I had no hard landing or anything similar which could have distracted the accelerometers. My questions: Is there any way to calibrate all gyros and accelerometers on the ALTA system? What can I do to make it safely fly again without red flags showing?