Not saying this is the reason your shut down, but may contribute to the disscusion, I had an idle up setting on the UC switch for my JetCat but had not noticed that the idle up also moved the high throttle curve outside the ECU learnt limit, so take off normal, select UC up instant shut down, good job it was in an Elan, quick 360 and landing without any problems. The Futaba 12FG's latest software update has an idle up facility that only operates on the low end of the curve, I don't know if JR Tx's do something similar?

Mike