nothing was using cgminer. I used Hex Miner for the TechnoBit devices. Those kept going. I use bfgminer for everything else. It's embedded in the mess of text I wrote, but that part is in there.

The ones that lost the hash rate stopped hashing at Eligius. The BFL units on one instance of bfgminer went into failover, and the KnC on a separate instance dropped to less than 800 MH/s

Oddly enough, I have a total of 330 GH/s after the two TechnoBit units died the other day. I'm still at the computer after writing the postyou've responded to. My hashrate at Eligius has dropped again from ~330 GH/s to ~265 GH/s. bfgminer shows the KnC and BFL units to be hashing fine. Curious if this is a stats issue, si I've switched everything to another pool again for 24 hrs to see what kind of hashrate stat i get. Perhaps i have more HW issues than I thought, though bfgminer is reflecting this in no way whatsoever.

I've been messing with this crap for hours every evening for over a week. I'm burnt out for now. I'll check in tomorrow. Appreciate the help.