Replacing the class 4 SD card with a class 10 gives better read/write capabilities to the linux platform.   I'm still having a problem with reboots though.  The miner will run for a while, heat up the DC/DC on the boards and then blank any submissions, yet bfgminer stays open for a few minutes until the counters reset and start mining again.  Lots of delays between submissions.  The first 8 hours of mining has been sporadic at best.

Throttling all hot DC/DC cores back to 275MHz to see if the hardware is just stressed.  In 1/3 of a day, I have only roi'd 1 ltc.    More details to come.