SuSE 8.2: X seems to cause system freezes

Hi, since installing SuSE 8.2 a couple of month ago I occassionally experience system freezes when performing certain tasks under X (e.g. watching certain pages with Mozilla, trying to turn off the background image in KDE, etc.). I already played around with the configuration (I attached the current config) but this didn't help. What else can I try? Can I downgrade to the XFree86 from SuSE 8.1? Felix -- To contact me in private don't reply but send mail to felix DOT klee AT inka DOT de