I have a super cub with a g 23 and ch electronic ignition.. I am having the same problem.. Funny thing is that it flew fine, until about the 3rd or fourth flight and almost lost it in the air.. Now with the antenna full down, and about 10 paces away it goes insane.. I have unplugged every servo and have determined it the trottle servo, or ignition.. Thryed moving stuff, batteries, ect, ect,ect.. I am about to say heck with it and go pcm.. havent tryed that yet, just used fm.. Funny how it went all crasy at once..What do you guys think??