only sometime bit of tail woggle 
reason the baldes are loose. Tighten it but not too much. Today I try to fly connecting battery and throttle up. After lift up lama nose to left, quickly landing and triming transmitter. Again in air around 2 feet high suddenly lama rotate her tail to right quickly and the mean time a unknow voice come like the signals are interupted 
. I land the lama disconnect battery, turn off tranmitter and check antena and also trims too but nothing found 
Now lama's position connecting battery the light of 4in1 going to green...throttle up both blades rotating as usual but heli wont lift off 
spining, nose to left and 4in1 light goes red...maximum throttle up but the situation is the same as I tell you. I sit near the heli and check spining controls with transmitter up, down, right, left they reponding properly... I dont know what's wrong with lama 4. Any problem with 4in1 or with the tranmitter 
Please need your advices for correct her to again in air
