Servo Tripping out

[Suggitt]

As it says in the title, the servo trips out as i land hard on the front end, i have tried different servo's from different cars and same problem, when i put the servo's back in the other cars there ok again. Ive tried different recievers and crystals and it still cuts out.

Anyone any other idea's? Apart from not landing on the front end so hard

Its only happening in a XXX-CR:eh?: