Hello guys

I want to share my experience with you hoping that nobody will get the same problem as I had any more.
I lost worth 7000 $ in my A-4 crash this morning due to a Spektrum glitch.
I've come to this conclusion after working all the afternoon on the wreckage , re-connecting all the servos and power supply outside of the airframe and benchmarking it over and over.

UPDATE: the failure of the receiver is due to the soft switch short-cutting. Please read this http://www.rcuniverse.com/forum/m_7221837/tm.htm and the 5th page of this post

It was very strange: the radio locked ( I don't use the word failsafe on purpose ) in a full thrust turn, leading to an uncontrollable engaged turn to the ground.
At no moment the failsafe engaged; the engine remained at full thrust and didn't cut as programmed and verified before the flight ( this happened during a meeting ).
I recovered the control about 1 meter before the impact that was just enought to get the wings leveled and the engine shut down by the switch ( no fire ).

Just before the flight:



and just after:



It looks like at this stage that some of the jets components have a major influence on the working of the chip of Spektrum receivers.
It seems that some radiating HF component ( probably the ECU ) locks the receiver chip by jamming it.
I've done extensive tests and this appears when the ECU and/or fuel pump are close enough to the receiver ( less than 20 cm/ 8 inches).
The RF link remains rock solid with no frames dropped and no hold showing on the flight log but the receiver locks and the servos do not move. This for a unpredictable duration ( till this chip unlocks ).

We've and 6 major glitches of this kind for the past two weeks on 5 different aircrafts and AR9000 as well as the brand new AR9100 on my A-4.
After a lot of discussions we found out that the common point on all these systems was the direct proximity of the ECU and/or fuel pump with the receiver.

On the other hand I have conducted some extensive flight tests with my Phoenix, putting more than 100 flights with the same Spektrum system and 2 different generation AR900 RX with rock solid RF performance.
Until now my trust in Spektrum was total.

Now I believe that the Spektrum RF link is extremely good but the chip design prone to a major bug...

So please, if you fly Spektrum systems make sure that you have more than 20 cm/8 inches between the RX and any radiating device like ECUs, electrical motors, switching regulators, datalink systems.