Hi guys, I've been struggling with my phantom 2 for weeks now, trying to get him up and running again. After having an accidental crash, I replaced all the motors because either they were sounding differently or the props where not easily inserted on them, so I decided to change them all. During this process I accidentally dropped some solder in a ESC board (Yeah, I'm that lucky), so I ordered a couple of them. The new ESC board came with version 2.1 while the others are version 2.0 I believe, (they don't say 2.1 on the front sticker like the new one says) Well after making this change I decided to try it out, I first calibrated the compass as usual, which according to the lights it was calibrated, but then I couldn't get any GPS signal after waiting for a while, but I decided to test it anyway just to see if it was working fine. The end result is shown in this video: http://youtu.be/ZomipXZcNcg After initial lift off, everything seem to be working fine, there was a little wind but nothing important, but after only a few seconds it immediately lost altitude and dropped down drastically. Ended losing another 2 props and 2 prop guards because of it. I decided then to check the GPS board and found out the ceramic part was broken, so I odered a new one and got it replaced, got the GPS signal back. I also tested out the RPMs from the motors using a Laser Tachometer, they were all giving me around 2800RPM, I'm not sure if the guys who tested them out was doing the test right though, because he didn't test them with the props on. Anyway, after the GPS was back on I decided to give it another shot, but the same altitude problem arises. I even noticed that it starts to turn by itself too, not so much, but it does. I emailed DJI tech support, which told me to send the unit for repair. I'm not from the US so it's not that easy. They said that it can be related to the different ESC version installed. I already ordered as ESC v2.0 (hopefully) and will try to replace the v2.1. I was wondering if anyone else has experienced this before and if it is in fact an ESC problem. Thank a lot for any replies! Regards.