Many remountings caused mine. The crack developed in the paint after 5 or 6 remounts, it actually runs around half the wb. Don't forget i've been using this for 2 years now and its been through a ridiculous amount of rebuilds. The base has been pulled away from the block cover over time. The crack through the paint is 1-1.5mm wide but I don't doubt the solder failure is no more than a pinhead at a single point.