What type of batteries are you using?
Over the years, I have tried a plethera of battery systems in jets that have all worked out.
I have used Nickel Metal 6V systems to 7.4 Lipos with regulators.
Now I am going to 6V Nicads (for the servos) for the simply reason that
1. weight is not and issue
2. It may be old school, but the technology is pretty reliable!
Chime in anytime with your thoughts.