The system freezes when RAM gets completely full. By using MATLAB, I can get all 8GB RAM of my laptop full and it immediately freezes, needing restart using the hardware button. Other people have reported the bug at since 2007. It seems that only the 64-bit version is affected and people have reported that enabling DMA in BIOS settings solve the problem. However, my laptop lacks such an option in the BIOS settings, so I am unable to test it. More information about the bug could be found at: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1162073 and https://bugs.launchpad.net/ubuntu/+source/linux/+bug/159356.

Best Regards,
Ivan