ORIGINAL: Sessholvlaru
Naturally I assumed that the problem was something other than the servo, as 99% of my planes have Hitec servos, and I have never had a problem with them. I checked everything including linkages, connections, etc. Plugged the servo into a different channel, and it was still doing weird things. I then remembered that the plane needed elevator trim a few times before, but it was no where near as severe. It was windy when I flew it last time, so I thought that may have been the culprit. I now know the servo was acting wacky since the second I first gave it power.
I've purchased hundreds of servos, among which were many Hitecs.
To date I've had the highest out of box failure rate, not due to overstressing, breaking gears, etc.with Hitecs.
I've had two Hitecs that reacted exactly the same way, I sent them back for replacments which worked, but be forwarned.