LMDE - nahodne restarty x serveru

Dobry den, velice nepravidelne (jednou se to stane 3x denne, jindy jednou tydne) se mi pri prohlizeni webu (Chromium 13) - a to obcas primo pri stisku enter pri vyhledavani na google nebo jinde restartuje x server zpatky na logovaci obrazovku. Po progoogleni jsem zjistil, ze dost lidi s tim ma problem, ale nenasel jsem zatim zadne poradne reseni.

graficka karta je nVidia GTS450, tady je vystup z logu xorgu

[ 19417.202] 
Backtrace:
[ 19417.203] 0: /usr/bin/Xorg (xorg_backtrace+0x26) [0x4618e6]
[ 19417.203] 1: /usr/bin/Xorg (0x400000+0x65d09) [0x465d09]
[ 19417.203] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f416c64e000+0xf020) [0x7f416c65d020]
[ 19417.203] 3: /usr/lib/xorg/modules/drivers/nvidia_drv.so (0x7f41668f6000+0xef5a9) [0x7f41669e55a9]
[ 19417.203] 4: /usr/lib/xorg/modules/drivers/nvidia_drv.so (0x7f41668f6000+0xf287f) [0x7f41669e887f]
[ 19417.203] 5: /usr/lib/xorg/modules/drivers/nvidia_drv.so (0x7f41668f6000+0xbb076) [0x7f41669b1076]
[ 19417.203] 6: /usr/lib/xorg/modules/drivers/nvidia_drv.so (0x7f41668f6000+0xbb712) [0x7f41669b1712]
[ 19417.203] 7: /usr/lib/xorg/modules/drivers/nvidia_drv.so (0x7f41668f6000+0x7e14b) [0x7f416697414b]
[ 19417.203] 8: /usr/lib/xorg/modules/drivers/nvidia_drv.so (0x7f41668f6000+0xf1110) [0x7f41669e7110]
[ 19417.203] 9: /usr/lib/xorg/modules/drivers/nvidia_drv.so (0x7f41668f6000+0x46a542) [0x7f4166d60542]
[ 19417.203] 10: /usr/lib/xorg/modules/drivers/nvidia_drv.so (0x7f41668f6000+0x46a82f) [0x7f4166d6082f]
[ 19417.203] 11: /usr/lib/xorg/modules/drivers/nvidia_drv.so (0x7f41668f6000+0x459c9b) [0x7f4166d4fc9b]
[ 19417.203] 12: /usr/bin/Xorg (0x400000+0xdd586) [0x4dd586]
[ 19417.203] 13: /usr/bin/Xorg (0x400000+0xd8694) [0x4d8694]
[ 19417.203] 14: /usr/bin/Xorg (0x400000+0x32ee9) [0x432ee9]
[ 19417.204] 15: /usr/bin/Xorg (0x400000+0x26ffe) [0x426ffe]
[ 19417.204] 16: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xfd) [0x7f416b38dead]
[ 19417.204] 17: /usr/bin/Xorg (0x400000+0x272ed) [0x4272ed]
[ 19417.204] Segmentation fault at address (nil)
[ 19417.204] 
Fatal server error:
[ 19417.204] Caught signal 11 (Segmentation fault). Server aborting
[ 19417.204] 
[ 19417.204] 
Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
[ 19417.204] Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 19417.204] 
[ 19417.215] (II) Power Button: Close
[ 19417.215] (II) UnloadModule: "evdev"
[ 19417.215] (II) Unloading evdev
[ 19417.215] (II) Power Button: Close
[ 19417.215] (II) UnloadModule: "evdev"
[ 19417.215] (II) Unloading evdev
[ 19417.216] (II) Riitek Micro Keyboard: Close
[ 19417.216] (II) UnloadModule: "evdev"
[ 19417.216] (II) Unloading evdev
[ 19417.219] (II) Riitek Micro Keyboard: Close
[ 19417.219] (II) UnloadModule: "evdev"
[ 19417.219] (II) Unloading evdev
[ 19417.219] (II) AT Translated Set 2 keyboard: Close
[ 19417.220] (II) UnloadModule: "evdev"
[ 19417.220] (II) Unloading evdev
[ 19417.222] (II) Logitech USB-PS/2 Optical Mouse: Close
[ 19417.222] (II) UnloadModule: "evdev"
[ 19417.222] (II) Unloading evdev

Dotaz: LMDE - nahodne restarty x serveru