Every once in a while the pitch servo (right side looking at the tail) would every so often pull causing the heli to dive to the right. As it progressed...got worse...eventually would pull hard enough for me to loose it and hit a stationary object. At the end...the 3-1 would actually diarm too. Very strange stuff to be sure. Got 3 HS-55's comming from an Ebay store new in the wrapper at the lowest price I could find anywhere (about $12 per unit for total of $39.xx). While I was at it, I ordered new Bell Hiller grips and micro heli stainless shaft from Horizon which I took out on the last crash. If it's not the servos (and I'm 99.999% sure it is), then it's the radio and that would really SUCK because the radio is about new and I got 2 AR6000's for it. I haven't had any glitches in the plank I'm flying on the other AR6000. I'm going INSANE waiting for parts...sheesh! We had a couple eve's here where the wind was NONE///notta, I don't have squat to fly. Corsair is down for Prop, Cub is down for prop, heli down for grips/servos/main rotor shaft.[] The HS-55's are not better than the S-75's persay. They don't have quite as much torque power but they're real close so it makes them a more reliable (so I've heard) suitable sub for S-75's. They will still fail with hard landings etc but they shouldn't just "burn out" like the S-75's. I might start using Futaba servos that are comparable to the S-75's. I've never had Futaba anything go bad all the years I've flown it.