I had a similar problem. It turns out in my case that the r8169 networking module was unstable. Uninstalling the vanilla r8169 module Using the Realtek proprietary r8168 module solved this for me. I have no problems with stability now.

Natty freezes constantly after install
I am looking for a different, common English idiom that expresses the same thing as a snowball's chance in hell.  My teacher says I use this expression too much, and that it is not appropriate for every essay. I need a same meaning like something very cold in a hot place to have a little chance.
