Does anyone have one of these Futaba 3PRKA TXes?

I got one with a R203GF rx, every now and again (without any pattern) it glitches. Does not depend on environment; happens regularly where ever I run it. It looks like the signal drops out, the signal light switches off and the throttle goes to failsafe. Adding a cap to the RX or running directly off batteries doesn't do anything.

I can't check the TX/RX individually as I dont have another Futaba FHSS TX.