As previously mentioned, it looks like a libata driver issue with VIA chipsets. I read on linuxquestions.org that some on Fedora are having a similar problem, so it is not Ubuntu specific. Rather it seems to be a VIA chipset + libata issue.
Sadly, the way we solved it is by purchasing a new motherboard + CPU. I surely will stay clear from VIA chipsets in the future!
As previously mentioned, it looks like a libata driver issue with VIA chipsets. I read on linuxquestions.org that some on Fedora are having a similar problem, so it is not Ubuntu specific. Rather it seems to be a VIA chipset + libata issue.
Sadly, the way we solved it is by purchasing a new motherboard + CPU. I surely will stay clear from VIA chipsets in the future!