i have had this happen when using the foot sensor every so often. the key fob and button on hatch has never produced it for me. i also have issues with the hatch opening and closing itself and i believe that the sensor is just way to sensitive. likely causing the "half way open" issue as well. My theory anyways. I do have this on video and showed it to my dealer but Ford doesn't have a solution so they couldn't do anything or were unwilling to try to do anything.