something's up with my tail motor. sometimes my heli is behaving exactly how i want it and the tail is in check. at other times, it seems like too much juice is geting to my tail motor and it's hard for me to trim out and no matter what i do to the gyro and trim, it runs on the high side. then the next time i try it, say the next day, it's back to normal. any ideas what to check for? is this a common prob with the tail motor? i have a honeybee, running 11.1v, maybe 20 packs on the heli. thanks.