posted to the other thread too yes i replace 4 in 1 and it still done it. check wires around the shaft coller and on the rear if the chassis two places i've seen get nicked.servos can cause a lot of problems that are totaly unrelated to them like shorter flight times glitching etc.had 1 that would not arm the speed control after trying evrything including tx i told my buddy just unplug the servos and see what happens and sure enough it arme like a new one.
Rich