I have recently replaced the main board because of an issue with the 5V regulator. All ESC's have been soldered in the same manner in which the original unit was. The motors spin up (test and active flight) without fault. The problem begins when I begin to take off. I will apply two thirds power and the unit will flip over and attempt to cut my grass. I have ready a few different threads of people that have experienced the same but none have reported how and or if they were able to resolve the issue. Any direction would be appreciated.