LinuxFloat

Some issues on my newly installed debian testing system. 1) Kernel 3.* make my cpu hottest of more then 10?C respect to 2.6.39, the latter image being unreacheble in Debian repos. It worked fine and so i'm not able to re-install it (I've changed HD). 2) Sometimes halt and shutdown -h now do not really shutdown the system, but reboot it. How to fix? 3)Sometimes when i open new tabs in terminals, machine hostname changes, dunno why, and i must /etc/init.d/hostname stop/start to recover it, how to fix?