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Since the current crop of CPUs have brought the memory controllers on-board, they are sometimes power hungry doing memory movement at times when the rest of the CPU is off doing other stuff. This could create a low voltage situation resulting in memory failures. Check the BIOS to see if a .1 boost in memory and/or cpu voltage is possible as this may smooth the way for the memory.
Also, are you by chance overclocking? This also takes extra power. Many of the current generation mobo/cpu combos have easy utilities for this and many come pretuned to overclock from the manufacturer/assembler. This allows a lower cost chip to perform like a more expensive cpu.
I have had mobo batteries fail within the first month. It happens. Not often. Most run for 5+ years with no problems. I have one that is over 8 years old and still running fine.
It is the same with power supplies. They can pass all the tests in the world and then fail the next day. Stuff happens. Suspect everything.
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