My nephew's SkyFly has suddenly decided that it doesn't want to respond to radio control once it gets about 100 yards away from him.
They have run several tests and the plane clearly responds fine if you keep it close to you, but as soon as you venture too high or too far out, the control surfaces immediately go to full throw (same way the plane sometimes acts if you put the battery in with the transmitter turned off).

He has tried the following -

New batteries in transmitter.
Swapping out receiver crystal with known good crystal and used a different transmitter.

He has crashed the plane a few times and banged it up a bit, but the control board doesn't show any obvious signs of damage.

Do you think the receiver antenna could possibly have a hidden break in it?

Thanks, Kevin.