Otso, our electrical engineer, noticed that our nice boards can at times be destructive. Naturally we wish our boards were of high quality and destroying your precious Raspberry Pi is far from that.

This is related to power spikes at the moment of cable disconnect, so a solution is in the works now that we know the culprit. Zeners as a first fix and perhaps transzorbs for a more real solution. New board design anyway.

ELL-i site blog has a more detailed post about this