anyone have problem keeping the aerohawk in same altitude? i can't.. it keeper going up and down.. expecially.. when i use rudder to the right.. which the tail draw more power... then the helicopter drop down.. i guess due to the main motor losing power??? is this normal.. meaning i have to thorttle up as i turn? or just mine is screw??? hahahaa.. so hard to fly... still... can't stay in the air more then 6 second.. HELP....