I am trying to figure out a problem. I recently changed the blades on my phantom 1 for vision 2 blades. They look exactly like the other white plastic blades. Problem is duofold. I also had a small crash runningn into leaves at about shoulder height with a slow fall at the end. My copter now can lift off, fly 5 or 6 seconds, then it starts to descend like a low battery i havent checked the warning lights I was too busy trying to catch the copter. One handed catch by the way. So can it be a mismatch of blades, although they are supposed to be compatible, or do you think it is from the knock I did replace the battery and it was fully charged. Even ran the Naza software and it read the 12.1 voltage exacly so the copter is seeing the proper voltage. I did notice that one of the motors seems a bit easier to slow than others in idle but it seems to take off normally. Where should I start to debug. Has anyone had a simiiar experience? I also changed the blades because I cracked two. One in the fall and one right after. The new blade has two sets of opposing arrows. I put it on the reverse blade so it tipped on crash off, I mean take off lol. I should have just looked at the blade and known which direction by the higher cuttin edge on the direction side. Any suggestions other than buy a new copter?