A fresh charged 5 cell pack is putting out close to seven volts, maybe the 368 is unhappy running at that voltage.
Could it be that in other installations where this same servo was running through an exstention and there was enough of a voltage drop to keep from frying the the servo in question?
ORIGINAL: Jetflyer 24
I run 6V dual packs on separate channels ( two switches ) without a regulator ( never used them, don't like them ) on all my Jets and this has never been an issue, also keep in mind that this is NOT a new Jet, this jet was built for me and it has been flying all year since October of 05, this started happening now.