Same thing happened to me w/ my UCD60. I tried everything!! Swapped servos, crystals, extentions, switches, batt paks, locations of everything and even took my complete flight pak out and laid it out onto a piece of board, in the same configuration as it was within the plane, so that I could move the anntenae around. I even tried a different Rx from another plane and the problem continued. couldn't fly the plane for 2 months after completion


***Turned out that I somehow had fried both receivers. One, with a bad 4.8v pak and one with an unregulated 6.0v pak. If you're gonna' use 6v's, regulate the pak.

Hope this helps and good luck!