Even relatively small differences in the timing of the memory chips can cause reboot problems. It is not generally something you can fix except by replacing the ram, it's always recommended to use chips from the same manufacturer and preferably even the same exact part number.
What exactly the problem might be with the ram no-one would ever bother to find out because it is far cheaper and infinitely quicker to just throw it away and replace it. These circuits run at speeds of hundreds of millions of operations per second - any kind of defect can be a problem.
The reason they don't show errors in the event logs is that the system has reset before any data could be written - in event logs you sometimes get a warning with 'the previous system shutdown at 'TIME' was unexpected' but little else.
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