I have a Phantom 2 Sundance edition from DSLRpros.com it has the Futaba controller. after many successful flights I have had two crashes recently. Both instances appeared as though in stable flight that i just lost thrust power even with throttle stick full up and fell to the ground. This was full battery calm day around 25 feet off the ground moving forward. After the second crash i did a quick diagnostic and it seems as though when I start the phantom motors running now the blades do not increase speed till after the stick hits center point. trying to lift off at full throttle barely lifted me off the ground. I have been using the out of the box configuration for the phantom and the controller. I just ran the assist software and it performed two updated but this has had no change to the throttle control. Has anyone seen this type of issue or can you tell me what i may need to do to correct this and why it may have happened? Appreciate any feedback that might help.