Hey Tim;

Keep in mind that some unusual memory problems are actually sector failures for the swap file. I have had this before. I don't know how you might check this, but maybe schedule a full disk scan including sector checking for your next boot. Maybe disable the swap file before doing so to allow for the scan, and recreate it after the boot. Sounds like I don't have to warn you, but make sure you will have enough contiguous space for your new swap file after the reboot.