almost certainly will have been down to your motherboard going pop. The lower the better tbh, try at 2.0v and work your way up in .05 step until you find a stable set up. For example mine are rock solid at 2.05 and that's on a overclocked set-up, but some have found even lower volts to work fine.
Probably because they have a huge sell through via various resellers and only a small percentage of returns?, its just you get to hear about some of those returns on boards such as this. It's worth remembering the majority of ocuk's customers probably never post on this forum or even know of its exsistence add to that most happy customers never coming looking for answers.....(the bigger picture as they say)