went to do a tx calibration yesterday and while I was getting ready to start the calibration I noticed that all the settings were in the central position , solid as they should be but the yaw/rudder was moving very slightly to left and right, maybe about 1/32" on the line, when I flicked the ru switch it stopped and settled in the center the same as the others, if I moved the ru stick slowly and let it return slowly the movement started again until I gave the stick a flick, even after calibration it still done it.
I'm not going to go inside the TX and start messing about so now if/when I notice a tail wag again I know what to do,
last week I tried playing with the gains but made no difference.
ray