R/W mount of / denied

[prodius]

My situation: 2 yr old quality hardware from commercial firewall with 2.5" WD scorpio HD inside. Everything works fine, but when I cut the power without halting/rebooting I get the following:

Trying to mount root from ufs:/dev/ad0s1a
WARNING: / was not properly dismounted
WARNING: R/W mount of / denied.  Filesystem is not clean - run fsck
WARNING: R/W mount of / denied.  Filesystem is not clean - run fsck

I know there is another topic about this, but the problem goes beyond this.

I reboot in a single user shell and run /sbin/fsck -y, all problems fixed. I reboot again, but then the booting of pfsense fails with a bunch of php errors (have no example). The machine is wasted and reinstall is only solution I know right know.

Can someone please verify my findings? I need to find a solution, the hardware is being placed with a customer, so I can't do much tests after today.

thx,
Günther