Having a similar problem with an AR6200. Have tried 2 known good batteries and at some point both receivers must loose power becauce when I land both are slowly blinking as if had been subjected to low voltage. The heli has almost been lost 3 times and all on landing. Once it piched nose over even with full back stick, same thing to the left, and once throttle hung at hover speed. this has always been close to the groung and I was able to recover the heli before disaster, but it is grounded til I hear from Horizon I have had NO problems with the same TX and the 2 AR6100es I am also flying. I am thinking about putting one of the 6100s in (keeping it close in), to see what happens. I can find nothing wrong with the rest of the heli.