5.4-REL random reboots

[Bas Essers]

thanks both

I just came back from running memtest86 thru 3 passes and no error were 
found. It seems to do a whole lot of different tests.

The NIC idea sounds possible since the machine wouldn't reboot for some 
hours when i set my 'external' interface to down. I can't do too many tests 
however because this rebooting must be killer for my harddisk... I will try 
another NIC.