Anyone else have trouble breaking servo cases?

[coupehdi]

Hi guys, Ive been racing mardaves for about 6 or so years now, always used a futaba s9550 servo, a few weeks ago the casing broke on it, it broke near the top side of the servo just at the mounting lugs, i thought the kit mounts may have been partly to blame because of them only mounting to the servo with one screw, so i replaced the mounts with alloy ones from a schumacher mi4, this attaches it solidly to the chassis with 4 screws, put another s9550 servo in and it has only lasted one week before breaking aswell, is there soemthing im doing wrong, obviously if you dont hit the car it wont break but ive had that last servo in it for 6 years and it was fine and my driving hasnt got any worse lol. im using a kimbrough servo saver by the way, ive a new fastrax one orderd along with a new servo hoping it doesnt break too cant afford to be changing servos all the time. Thanks for any help.