MG: I have had simular troubles before,it always happend after a complete recharge i would do my flight chk and one servo always lagged behind so to check this i swaped servos from side to side and it still didnt change one bit,mind you this was all new equipment installed into my new aeroworks 540.well to make a long story short it turnned out to be the( generic servo extensions) i installed.so the I hope this helps

good luck Bill