One board stopped hashing a couple hours ago. Red light on board was off. System only showed 2 boards. I shutdown, reconnected the cables on the non-hashing board, rebooted and now all 3 hashing..... for now.
The problem with the 14.0s was bad risers, burning out. There was a recall and not very many were shipped, so most got fixed from the factory. The concern is there might be some floating around resellers. There hasn't been a rash of complaints here so it seems like it's not a huge deal.