> If it happens in a somewhat high load phase, then I suggest you monitor 
> your CPU temperature...
> 
> Oh, and if you need to heat the box up a bit, I suggest compiling a 
> netbsd-current distro with all the sets ;)

It would seem logical, but it happens on IBM TP T40 laptop (usualy even
run on battery and low cpu speed) and is in no way connected to cpu load.
It just happens while I surf the net!??? 

jj