ORIGINAL: thefalcon
I thought of radio interference for a while, but it seemed improbable that all three channels controlling the swash would experience a glitch in the same direction--without any apparent yaw or throttle glitching. Mechanical problems seemed much more likely.
It has to be something with the way the head is put back together becuase I have the same problem with mine after putting it back together and it work fine before I took it apart even with a stripped out main gear.