don't be a spoon, the TG series are awesome... set them up correctly and theres no way they should die unless something goes mega wrong.
and dont run them on lipo. there are the HV models for that.
1256TG, 1258TG servos are what i've ran for years an never had one die...
the new brushless HV servos look to be very good too.
the Savox's you'd probably seen die are ones that have not been setup correctly.