Ubuntu 11.10 - Gnome 3.2.2 -> Windows and panels restarts often and random

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http://askubuntu.com – I got a wired problem: On my notebook (Athlon X2 64 bit with Radeon HD 3400, new Catalyst 12.1 - Ubuntu 11.10 with Gnome 3.2.2) I experience random and often restarts of my gnome panel on top and the window-borders (the black ones around, where you can find the X to close the window). I got an custom theme from Sayta (webup8.com) and installed ubuntu tweak. The only tweak I used is the one that shows the minimize and maximize buttons in the window. Does anybody elso experince such behavior? Thanks a lot for your answers and tips! Best regards, mpm (HowTos)