Interesting about the CMOS battery: one of those went out on me three years ago. Windows started complaining about hard drive failure. A few reboots later the battery was too weak to keep the BIOS settings and soon DOS prompt came up complaining about no boot device. Personally I don't think the problem is the battery, but a computer is a complex machine, so I wouldn't be too amazed if it actually is a battery problem.

It was a new motherboard, but I guess the battery that came with it was not. Probably sat on the shelf somewhere with thousands of other batteries before being used in that motherboard. I'm not that familiar with battery failures. Another thought comes to mind could be RAM... I've had strange things happen with mixed RAM manufacturers, heat of the computer, and internal clock all working together to go crazy at 2:41 AM every night.

I agree, though, it could be a software problem. But we'll need more information... such as what was the last software installed? Any malware? Has anyone else come up wth this problem? Is it just for this one particular project that makes this error, or any project being saved? etc. But without additional information, and from my own trouble with a glitched object, I'm thinking physical.

--Death_at_Midnight