RE: crash nothing wrong
Just a guess but I saw very early when 2.4 was just sweeping the market that they are a bit touchy to the direction of the antenna to the plane and you can have signal loss if it is pointed wrong. Just one of the little things about the system. Switches and batteries can get shorts without any signs of being bad and jump up and bite you without warning. Any type of radio glitch is very hard to locate after a crash so all anyone can do is bring up little things that it could have been.