Hi dear maintainers, now I could verify the package which causes the freeze of my system: They are the Nvidia-packages (100.14.11), which are causing the freeze. A bugreport has been sent. I downgraded first the kernel, with no success. Then downgraded Nvidia-packages and it was o.k.. Upgrading kernel was o.k., too. Upgrading Nvidia-Packages did show the bug again. I hope, this information will be interstested for other users, too. Regards Hans