IPhone 3GS shutting down during phone talk

Hi.
My new iPhone 3gs is shutting down sometimes when I talk on it.
I suspected it was a battery problem (I saw once the battery meter drop to zero), so I installed the "powerlogging" profile.
Now, the log in the itunes folder seem to suggest that "SpringBoard" is shutting down due to kIOPMPSAtCriticalLevelKey battery notification.
I already tried restoring the phone, but to no avail.
I'm running 3.1.2 (and won't upgrade because I hear many people complaining about the upgrade)
Thanks!

People complain about every upgrade. And the fact is, even it it was in the thousands (which it is less than that here, more like hundreds) that is a fraction of a percent to number of active iPhones. This last update is actually an important one as most of it was security related updates that fix holes in Safari and other parts of phone that will allow a bad website to pretty much get access to your phone data. So update. Who knows, could be since the update came out, they actually said what it fixed (normally they keep it generic but this time they said trying to fix security holes that would allow remote code execution) could be that since it was public knowledge a lot of script kiddies got hold of the hard core hacks and started posting stuff everywhere hoping to catch somebody just like you that was too slow to update and thus could be causing your issues.

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