Maximum PC

I've lost the last 3 bigadv work units like this. The first two were 2686's so I thought it might be a problem with just those work units, but the last one was a 6900. But what gives with this "CoreStatus = FF (255)"? I haven't tried a reboot yet, so I'll see if that helps.

[11:22:45] - Autosending finished units... [August 20 11:22:45 UTC]
[11:22:45] Trying to send all finished work units
[11:22:45] + No unsent completed units remaining.
[11:22:45] - Autosend completed
[11:24:44] Completed 185000 out of 250000 steps (74%)
[11:29:03] CoreStatus = FF (255)
[11:29:03] Sending work to server
[11:29:03] Project: 6900 (Run 38, Clone 10, Gen 29)
[11:29:03] - Error: Could not get length of results file work/wuresults_00.dat
[11:29:03] - Error: Could not read unit 00 file. Removing from queue.
[11:29:03] Trying to send all finished work units
[11:29:03] + No unsent completed units remaining.
[11:29:03] - Preparing to get new work unit...
[11:29:03] Cleaning up work directory
[11:29:09] + Attempting to get work packet
[11:29:09] Passkey found
[11:29:09] - Will indicate memory of 12279 MB
[11:29:09] - Connecting to assignment server
[11:29:09] Connecting to http://assign.stanford.edu:8080/
[11:29:09] Posted data.
[11:29:09] Initial: 43AB; - Successful: assigned to (171.67.108.22).
[11:29:09] + News From Folding@Home: Welcome to Folding@Home
[11:29:09] Loaded queue successfully.
[11:29:09] Sent data
[11:29:09] Connecting to http://171.67.108.22:8080/
[11:29:18] Posted data.
[11:29:18] Initial: 0000; - Receiving payload (expected size: 25469949)
[11:32:48] - Downloaded at ~118 kB/s
[11:32:48] - Averaged speed for that direction ~116 kB/s
[11:32:48] + Received work.
[11:32:48] Trying to send all finished work units
[11:32:48] + No unsent completed units remaining.
[11:32:48] + Closed connections
[11:32:53]

Source: http://fahwiki.net/index.php/CoreStatus_codes

*EDIT* I see RacerAC beat me to it. I'll leave my post since I included the source link.