Hi, does anyone know what could be the problem with the server? It went offline with this error (1) and then each time we reboot it, it goes offline again with the error (2) while overloading with apache/php processes. Can it be RAM? Other which other hardware failure?
Look likes typical errors generated by a server with ECC memory where parity errors in the RAM are detected. The best thing you can do is to remove/replace the memory modules in the banks mentioned and see if the problem is solved.
This type of error normally occurs during high load/temperatures of the components. Therefore a RAM test procedure may not show the error until all components like CPU, disks and power supply are back under full load.