XFX x58i BIOS V.1.3 reverting to default settings

[Great Mancini]

Hi everyone, I've been searching countless hours online due to my problem with my Xfx x58i motherboard BIOS issue. About two weeks ago I finally flashed my BIOS to version 1.3 using a cd and everything seemed to be running fine until I shut off my comp. When I booted it up it gave me the following:"CMOS checksum bad" error and it reverts back to default settings and I have to press "F1" to continue and it loses all my overclock settings.
From then on every time I shut down my comp for more than one hour, it gives me the same error. It is beyong fustrating since I can't keep any of my settings intact if I shut down the comp.I built my rig around 7-8 months ago and I have never had this or any problem before I flashed to the current BIOS, even with overclocked settings (took me awhile to find the memory oc and timings sweet spots but that was not a problem).
Like how I stated before I googled my brains out regardig this problem. Anyone out there has any kind of info or solution it would be greatly appreciated ! Here are my current Comp specs in default settings:

Xfx x58i MB BIOS Vr.1.3
Intel i7 965 watercooled
G-Skill Perfect Storm DD3-2000 2048MBx3 CL 9-9-9-24
EVGA 285GTX Watercooled
Seagate 1.5TB
PSU Ultra 1600 watt PSU
(If you need any additional info please let me know!)

 

[evongugg]

Try clearing the bios.
Try replacing the battery.