Try rebooting system after POST (Power on Self Test) then hit the ESC key to enter in basic menu and select the memtest option. This will take time so be patient or use another memory test program. This could be acting up when system uses memory in certain areas of the RAM and long extended periods. So running the memory test to check the RAM would be an area to check first. If you are able to reproduce this effect please send logs to support@open-e.com to see if we are able to find anything.