Sounds like you need a fly swat...or some bug spray
Mate of mine had a (notice the word 'had') nitro 30 size Concept....well...He went down to the beach to fly this thing...it was all fuelled up and buzzing away on the ground....but it wouldnt respond to any control input....the heli suddenly took off with Him trying to grab the thing.....too late......one very confused little heli soared up into the heavens....my mate went frantic with worry.....it takes a lot for Him to be scared....but He was scared all right.....heli went up till it was a dot in the sky....then came down doing some funky moves while heading towards town....maybe it was thirsty and looking for a Bar?? only kidding
Heli eventually splashed down...with a 'plop' and there it remains to this day.
Turns out that the battery must have been flat....in the transmitter I think...no failsafe either.
Funny story, but a bit expensive....My mate instantly calmed down when it hit the water.....poor guy....sure shook Him up.
Rob