Honestly the only issue I have seen with Futaba Rx's is when they were set-up without the two antennas being 90 degrees from each other. There was a local flyer at my field who was cursing his new Futaba radio, kept getting hit after hit, managed to get the plane down safe and he had the antennas at 180 degrees from each other. A while back a fellow RCU jet flyer experienced the same problem and posted it on RCU.
Not saying there couldn't have been another problem, but I've flown Futaba 2.4 since it came out and those are the only issues that I have seen first hand. I would be curious to see how the RX and it's respective antennas were set up in the plane.