I've had my Mavic for a few weeks now and didn't notice that the plastic pin that holds one of the RC antenna on is missing. I've folded and unfolded these many times and didn't notice until today. My guess is that it wiggled out. I know others have had this part missing. Is this a send it back to DJI thing or a send me the part and put it in myself thing? I don't want to send it back for something so easy to fix.