Hi everyone. Took my P3 pro out for a flight today but it wouldn't hover after auto take off. Noticed that the Vertical speed and the altitude was constantly moving- negative or positive. I re-calibrated the compass and went through IMU recalibration - made no difference. As soon as the P3 is powered on, V.S shows a value and the altitude changes - even reached maximum altitude whilst on the ground. Has anyone had this - any ideas? Only had it two weeks and flown it about 4 times (mainly up and down if I am honest) and last flight everything was fine. As soon as the P3 is powered on, DJI GO app shows drone descending or ascending at various rates e.g. 2.7M/S and just keeps going. Running latest firmware ( 1.5.70 Controller - 1.6.40 Aircraft). Had some error messages - "Barometer error" in Overall status, also "Ultrasonic system error please land as soon as possible" and Uknown error 42. I have attached a screenshot - this time it was descending at .5 M/S. Any Help much appreciated.