Not to change the focus of the original question, but I think it follows along; how I understand it, this is what happens to those who are experiencing a "failsafe" or "brownout" or "lockout" condition on their 2.4 GHz systems. I would imagine that most people are using 4.8V packs, and even with a full-charge voltage, with the higher cutoff voltage that the 2.4 Rx (Spektrum for sure, don't know about FAAST) is reported to have, the voltage drops enough during some maneuvers that the Rx "quits" intermittently until the voltage rises again above the cutoff threshold. Of course, by then, you've walked out to pick up the pieces and what's left works fine again.

Would using a 6V pack, with sufficient capacity, such as paralleling packs, be a gaurantee against this occuring?