Having a problem when I advance the Throttle in than the Green Light turns Red when past the half way point. The batteries are fully charged and each cell reads 4.20 V. This problem started all of a sudden one day when I went to fly. I have a CX2 that I was learning on and did a fair job on making it hover, etc. So I thought I would move on Up and got an EFlight CP Pro and it has been a real challange to fly it. I have the Plastic Flat Bottom blades on it , otherwise it is stock. I was able to get it to leave the ground and fly around without hitting too many things, but now ai can't get it to leave the ground and it trys to skoot around on its training gear. I would appreciate any help in what to check out. This is all new to me as I have flown airplanes for years, gas prior now Electric.

Thanks Bob Palmer