do your problem looks like this one?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/174185
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Random freezes, probably sata and sis 5513 related
https://bugs.launchpad.net/bugs/173477
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I have the same problem: the system freezes occationally, most at night.
And the hdd went crazy, every thing freezes, I can move the mouse a
little, but just a little. This happend every other day, some time I
wait for 40-60 mins, and it went away, but some time 2 hrs didn't make
any difference. Bu