I've just noticed that Obstacle Avoidance on my EVO II is no longer working. The Autel Explorer app shows it's on but the aircraft acts as if its off. Turning in off and back on doesn't help. I've also noticed the radar map will sometimes show an obstacle and beep, when there are no obstacles anywhere close to the aircraft. I ran the Obstacle Avoidance Calibration Tool and it showed Obstacle Avoidance was working fine and did not require calibration. I attempted to calibrate it anyway and I could see the B&W sensor cameras were all working. However, the red square that has to be moved to line up with the green square would not appear. At one point, I did it a faint red square to appear for just a moment but it soon disappeared, making it impossible to calibrate the sensors. Does anyone have any suggestions? TIA