Random crashes for no reason

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http://crunchbanglinux.org – I'm using the latest Crunchbang release (10 “Statler”) on an Asus A5S3J laptop. Sometimes (about once every 2 days) while I'm just browsing the internet, the whole system will just completely freeze for no apparent reason. The cursor stops moving and it will not respond to any key combination (not even Ctrl+Alt+SysReq). The Num Lock and Caps Lock lights are frozen too. The only way to restart the system is holding down the power button :(.I have looked in the /var/log/syslog, /var/log/dmesg and /var/log/messages files, but I haven't found any error or warning messages before (HowTos)