I've experienced some of these loss of control incidents and asked a lot of questions to try and get some help from several sources including AMA.

At my field the problem has come and gone and sometimes rears it's ugly head again.

I've had my gear checked out by Horizon and they did find a weak RF in one TX that I lost several aircraft with.

The conclusions I've drawn from my own experiences at our field are:

1. DSM/DSM2 that picks two random channels everytime you turn on your TX can often pick two close together and if there is a frequency issue in the 2.4 spectrum we share with others - you may experience a problem. The problem may be complete loss of control or a momentary loss of control.

2. Frequency Hopping is less prone to this interference in the 2.4 spectrum we use.

3. A lot depends upon where you are and what is going on about you (you can't see, it feel it or touch it unfotunately.)

4. Some of the Chinese RX's on the market and some of the counterfeits do not seem (in my experience) to deal with the temporary loss of signal as well as the branded items. (Again my conclusion.)

I've acquired a spectrum analyzer that works with my laptop and so far can visualize nothign that looks peculiar to my untrained eye.

I feel strongly that Horizon/Spektrum/JR may have a product liability issue here with DSM/DSM2 and maybe sitting on a land mine if they don't do something to address it as the 2.4 channels are just getting more and more users.

As far as support on this issue from AMA they do really try to help, but there does not seem to be a depth of resources internal to the organization that can track down the root cause here for us.

Relative to returning to 72Mhz - if it was so good then what are we doing on 2.4? I can surely remember stuff falling out of the sky both from interference and our own stupidity.

see http://www.rcmodelreviews.com as I think he has explains the problem in layman's language (at least two articles on Spektrum 2.4.).

My course of action is to upgrade the TX's to DSMx and migrate to DSMx to minimize the chances of ongoing problems. Yes, I acquired a Futaba 2.4 system too!