i think this is a known problem. Read this:
Max ddr clock based on DDR parts of C2 is 933MHz.
So, when you run with DDR clock 1104MHz, system stability can be unstable depends on ddr parts of each board, because it's over-clocking value so 1104MHz is not guaranteed for system stability.
give it a try with 933mhz and check if this run stable.
