My son has a Fledgling by ModelTech. We maidened it last week and it flew fine. Brought it back in for some adjustments and when we tried to start the motor again it would not work. We would plug in the battery and it would beep but when you tried to advance the throttle the prop would just flip back and forth. When assembling the plane and testing the engine it did the same thing but only like twice and then worked perfect. Now we can't get it to operate correctly 90% of the time. Some times we plug it in and it works fine. But most of the time it does not. Battery checks good, installed different rx and tx, different esc and no real change. works sometimes, sometimes doesn't. I'm stumped. Any suggestions?

skeeter[:@]