The beauty of wood is that each piece is unique and each piece has it’s own character. The grain in that particular piece of wood had a weak spot and couldn’t handle the thermal stress of being heated and cooled, dried out and re-humidified. It is also possible that the grooves were cut too deep and that caused a weak spot for a crack to propigate from. (The grooves are not cut as deep now.) That said, I guarantee these units, including the wood for 2 years. I have also designed these units so it is very easy to replace the wood if there is a problem.Ya my crack defiantly didn't happen from falling. I suspected the deep grooves as well because they penetrate pretty deep and it is where my crack originated from I THINK. Not 100%. Again, this is no way bashing Andy's work. His vapes are amazing products.
In my experience dropping the units has had no effect on the integrity of the wood, but I don't recommend it.