Cisco Switching/Routing :: 881 Loses NAT NVI Mappings After Reload?

I've just purchased a new Cisco 881.I'm using NAT NVI for my inbound static mappings. However, regardless of the fact that the config is saved to nvram, after a reload of the router, the NAT mappings are setup as traditional inside/outside mappings. This means that inbound connections in to the router on the required services fail, until someone logs on to the router and re-applies the NVI mappings.
 
Here's a sanitised version of my startup-config: 
 
!
! Last configuration change at 20:20:15 UTC Tue Dec 11 2012 by xxx
version 15.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption

[code].....