CMOS battery keeps dying every few months... computer starts but no beep to post

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I've had this computer for 2 yrs since I built it. Has a Asus M2N-SLI mobo with athlon 6400 x2. 4gigs ram, Nvidia 9800 gtx, 600W PS. Most of the time runs fine, no signs of problem. Clock's acurate no lost time. Every 2 months or so, in the morning go to boot up and no beep or post. Just runs all fans and everything but never posts.

After first time I figured out when I replaced cmos battery it works fine. But keeps happening every 2 months or so. Any ideas? Battery should last much longer than 2 months. I'm stumped on this one and even my professors at college don't know. One tech support guy said might be a grounding problem with mobo and case. But that sounds weird. Mobo is mounted like case manufacturer says with brass pins holding it up. Please help...
 
Just got a new cmos battery and it booted up. When I booted up it was resuming windows from hibernation.. Would that cause battery to die? Doesn't sound right to me... Please help. Can't keep buying these batteries.
 
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