Last night, following the positive feedback here on the forum, I updated my P3P to the latest firmware, left the .bin file on the micro sd card, because I was expecting a new battery today. This morning, went to the usual place where I test, open space, no interference, no metal on the ground nor around the take off area... As soon as I started the motors, the left front one started rotating so fast it made the drone tremble. Also the app (android version......) showed no connection to the drone, never experienced that before. I lifted the aircraft a few feet of the ground, but it went down suddenly and I freaked out, landed immediatelly, restarted the whole process and it looked it was fine again. During flight, the gimbal suddenly stoped working properly, and the camera remained slightly tilted for the rest of the flight. Finnaly while I was packing the P3P, I noticed the tiny screw on the tip of the left front arm ( the one that shaked violently ) had losen itself a bit, and a gap was clearly visible in the structure. Question: has anyone ever experienced something like this before?!? One motor going nuts? Should I've calibrated the P3P after the FW update? On the status screen, it did not asked for calibration, was seemingly fine. I am now trying to find a torx t6 screwdriver to try and tighten the little screw, before it leads to more structural wear.