I had my P3A in for reapir at DJI for about a month with the "ESC Error" message. Apparently they replaced the main board. (Under warranty). The last two days I get an erratic "No Signal" warning with DJI GO. I've also tried the Litchi app with no luck. I have video and it says remote connected but no control signal. I'm at the point of saying screw it and selling the bird at a loss and moving to another brand. It's been flying fine off and on but I had an important event to film for a friend today and couldn't fly. The display on my tablet indicates "Radio Channel Quality -Poor". Any suggestions?