Had a problem for a couple of weeks now.
I have windows XP Pro and my Mobo is an ASUS M2N-E-SLI which is less than a year old.
A few weeks ago after playing a game i had to do a cmos jumper change to get my PC to reboot.
Ever since then every few reboots i notice the time is wrong.
I go into the bios and can see the dates changed to either Dec 31st 2006 or Jan 1st 2007.
I have to manually change this'but again the process will start again a few days later.
Also occasionally i am getting checksum error-defaults loaded.
I know the jumpers on the correct cmos pins and don't really understand why this happens occasionally and not every reboot if there is a problem?
I had a similar issue with an Asus P5Q Pro - i.e., that a six-month old motherboard kept on losing it's time and BIOS settings (it also wouldn't come out of sleep mode properly). I replaced the battery and it fixed the problem. However, six months later the issue has resurfaced. This seems to be a larger problem at hand; surely it's not normal to have to replace a motherboard's battery every half a year?