Thanks for sharing the solution to the problem. This post will help others get pointed to the right direction.
PS. I solved my problem as well … had 11 cards up and running on my new rig that I had migrated from other smaller rigs. Nothing but a massive hole in time to get nowhere… kept rebooting and dropping temps etc. Well I re loaded the latest Hive OS as a last shot, well it have been up solid state for 11 hours now (normally rebooting every 20-50 minutes for upto an hour and a half at a time.
Still got some problems due to network drop outs though this time, setting up Watchdog to reboot on a network connection failure to the pool to see it that smooths things out