Ken is right. Using a 6 volt battery pack eliminates this problem, as the voltage will never drop below the cutoff threshold. however, I have myself done a lot of hands on research on this problem. I have two older rx and two newer ones. My dad has SEVERALmore than 10, and my brother has a good handfull himself. I believe that what the LHS guy is telling the OP is that to test which firmware you have, you turn on the radio system, and let the radio and rx link up. Then you cut the power to the rx and turn it back on quickly, and see how long it takes for the rx to rebind. My older ones would take over a second, while the newer ones will rebind immediately. This leaves me to belive I need to send my rx's in for a firmware upgrade. The upgrade improves re-binding time, but does not (to my knowledge) drop the nominal voltage cutoff. All of this is according to Horizon's website postings (which, by the way, have been posted for more than a few months now). This is not a new problem, but it is new since Christmas (or just beforehand).