We had a club member that was experiencing random glitches on 2.4. He finally lost a plane (never told anyone about the glitches till the plane went down). Turned out that the connection from the transmitter motherboard to the antenna was loose. It would intermittently lose contact, causing theplane to go into fail safe. This transmitter was relatively new, but I don't remember what brand it was.

Your best bet is to send the transmitter and reciever to Futaba, explain to them exactly what you experienced, and have them inspect.

Brad