Ultra 2 won't shutdown -- reboots instead

Thanks for all the advice! Sorry I haven't been able to reply until now, I've been busy painting my new apartment. :)

Here's the spool directory:

# ls -laR /var/spool/frontview
/var/spool/frontview:
total 16
drwxr-xr-x 4 admin admin 4096 2012-06-23 07:52 .
drwxr-xr-x 7 root root 4096 2012-06-22 23:11 ..
drwx------ 2 admin admin 4096 2012-06-22 23:11 boot
drwx------ 2 admin admin 4096 2012-06-22 23:11 shutdown

/var/spool/frontview/boot:
total 8
drwx------ 2 admin admin 4096 2012-06-22 23:11 .
drwxr-xr-x 4 admin admin 4096 2012-06-23 07:52 ..

/var/spool/frontview/shutdown:
total 16
drwx------ 2 admin admin 4096 2012-06-22 23:11 .
drwxr-xr-x 4 admin admin 4096 2012-06-23 07:52 ..
-rw-r--r-- 1 admin admin 194 2012-06-22 23:06 00_Downgrade
-rwx------ 1 admin admin 4060 2012-05-31 14:42 080_Poweron

And bios_ver.log has this:

09/08/2010 ReadyNAS-ProUltra2 V1.4

Does that suggest anything?

I did open a case with netgear support (18832887). They suggested performing an OS reinstall.

So I think my plan is to:
- Try claykin's suggestion of unplugging the ethernet cable and powering down from the front panel.
- If that doesn't work, try support's suggestion of reinstalling the OS.