I have a new Phantom Vision. Many times now, I get good GPS green lights and the motors started spinning but applying throttle (and even full throttle) did not provide enough power and it stayed on the ground. The propellers sped up a little, but not much and despite multiple tries, I had to turn the unit off. It's about 35 degrees outside so I took it inside to warm up and tried again. One time that worked, the other time it didn't seem to make a difference... but restarting the unit a couple times did seem to help. It's very random now. I can't figure out why sometimes it will rev up and other times the increased throttle does very little. Any ideas why this is happening? Could it be the cold weather? Is there something wrong with my unit? Once it does start working normally, the thing fly's great and seems to work as intended. However it can take awhile to get it going and that's frustrating. thanks for any ideas.