Twice while out practicing flying, I lost signal with the drone. The Crystal Sky monitor went to black and white with the last frame when it lost contact. All readings ceased and the upper right corner was red with the lost contact message displayed. I was flying over 8 to 10' tall corn at the time and dreading the search. I pushed the return to home button hoping it was still flying and soon I heard the familiar buzzing of my Mavic (Woody) coming home. This happened twice today, 1st time battery at around 30%, 2nd time the battery was at approx. 45% Both times in the same approximate location (200ish yards out) when signal was lost. Different batteries both charged to full this morning. Is there a separate system for video transmission and controller transmission? I could control it with the sticks even though the camera was dead.