When The helicopter is in the air it constantly spins no matter how much it is trimmed. The helicopter worked before perfectly and all the parts seem intact. When it spins it seems to try to calibrate itself or adjust because when I attempt to trim the helicopter it becomes more stable but then it suddenly spins much faster and makes a noise. It spins clockwise and I am turning the trim counter-clockwise. Everything else about the helicopter seems normal but it will not allow itself to be trimmed. It simply increases it's rate of spin if it becomes stable. One thing I noticed was that using different amounts of throttle appeared to make it either spin at a slower speed, or increase speed and make a strange noise. I know it is supposed to spin a bit more when more thrust is applied but this increase in spin was extremely rapid. The noise it makes seems like a familiar sound of a motor turning something into a different position and not the sound of something broken. We have tried removing all lighting but it it had no effect. We have other remote-controlled helicopters but they are not on at the same time. There does not seem to be any other form of interference which would affect it. I suspect it is trying to auto stabilize incorrectly, but what do I know. How do I fix this? It must have something to do with the counter-directional rotors which keep it stable, but why does it only happen when I trim it almost to the point of stability?