If he was right beside you and you were checking it after the crash, he could have been swamping you causing the problem. Was your transmitter on when the servos were jittering?

It is highly likely you had a problem unrelated in the air that didn't show up on the ground.

If he is in fact causing your radio to glitch when he turns on, I would send both sets in for tuning. That would be a huge problem.

You need 3 radios for 3rd order problems. I don't think its possible with just 2, but someone may know more about that than me.