It seems that its a specific kernel. Currently the wheezy stable 3.2.
The weird stuff is i have used this kernel sins it become stable and the problem seems to come gradualy, at first the firmware worked flawless. Could it be apt security updates later on affecting the kernel cousing this unstability?
In general i use only debian for my serveres. I dont like how things is layed down in ubuntu.
debian framework is very good and i have never had any big problems with it..
ubuntu has to frequent updates and a short lifespan then debian. That is a real issue for me..
Debian is also a more lightweight distro then ubuntu it tends to run with a better performance the ubuntu.
But dont get me wrong ubuntu is a good distro but for desktop use.
by the way i dont use any gui like kde or gnome so for me that is not important.