reboot DURING a portupgrade

[Ben Haysom]

Hi

I am running FBSD 5.3-CURRENT on a Duron 700Mhz 384Mb RAM.

When I do (as root)

#portupgrade -a

it comes back with:

Stale dependency: acroread-5.10_1 --> linux_base-8-8.0_6 -- manually
run 'pkgdb -F' to fix, or specify -O to force.

So I do

#portupgrade -a -O

and *everytime* it reboots itself before the portupgrade is complete.
Not a clean reboot though - it doesn't dismount filesystems before it goes.

I can't work out what it's doing.
There is nothing relevant in /var/log/messages.

Can anyone help?

Ben.