X5 chassis snap!

[Akky]

i have managed to snap the chassis on my X5, i have been running a 19t indoors for about 4 weeks upto now, and tonight i upgraded it to a modified. It all ran ok, then when it got to the end of the night and i was cleaning it down, i seen that the rear of the chassis had fractured all the way through the chassis to the top of the diff housing.

Anyone know if this will be a common fault, or has this just been an unlucky mould for me?

Will post a pic if i can.