Intermittent issue with drone stopping in all directions at an altitude of 100-200ft, it's like it hits a brick wall with an audible tone and a green arc on display. Today is first time this has happened with three different flights on three different batteries. There are no trees or poles at the altitude drone is flying so I tried turning off obstacle avoidance and the issue went away, turned back on and happened again. Tried recalibrating IMU and Compass to no avail. At one point couldnt even return the drone back to me as every direction saw collision with something. Has anyone else experienced this?