I flew with course lock yesterday but I noticed that it sometimes drops out off course lock back to normal mode for no apparent reason. Initially when I flip the switch to course lock, it works ok and the phantom flies in course lock mode but sometimes, after a while it started behaving like it is back in normal mode although the switch is still in course lock. Toggling the switch to normal mode and then back to course lock then reinstates course lock on the Phantom. On the occasions when it happened I was tracking an object sideways intending to pan the camera flying in the same direction to see the object dissapear in the distance as I couldn't keep up with it's speed. When I started tracking, the copter was facing course lock orientation so making it go sideways would have been the same in our out of course lock. Therefore I don't know exactly when it dropped out of course lock. I noticed it when I started panning but it might have fell back earlier. I have no idea when or why it drops out off course lock. Anyone else experienced this behaviour? I have a Phantom 2 Vison+ 3.0.