Also my rig with 4x6870 and 3x 6970 errored today. Im going to try something diff to see if i can help.
On one rig (4x6870) im going to disable the restart option. seeing as how the accepted shares reaches into 10s of thousands and phoenix is still going after the error the restart option isnt as important as it was. and the other rig im going to disable the down clock feature. Maybe one of these are causing the error as they are using resources to actively monitor something. what do you think?