After flying two batteries (uneventful) and getting ready to take off with a third (leaving the remote on the entire time), I noticed this warning (or something to that effect). Checked the signal strength and indeed it was only showing 2 bars while just 10 feet away from me. As it was getting dark and cold with the wind picking up, I elected to abort, but really wanted to burn the last battery down to 50%. Tried to clear the error by restarting the remote. Did the trick. Full remote signal and no more warning. Another thing. I had been getting a lot of bouncing back and forth between GPS and non-GPS in the app yet the quad was unaffected and retained GPS lock. Did another compass calibration and that issue went away, too. Just FYI if you ever see these warnings. Two simple things to try first.