Default Router being dropped

When setting up the static routes, we did this:

svcadm disable svc:/network/physical:default
svcadm enable svc:/network/physical:nwam

At first that worked. Once I upgraded to the snv_94 it seemed to start disabling the default route (like here).  I fixed this by just re-enabling the physical:default service, which then reads the /etc/defaultrouter

svcadm enable svc:/network/physical:default

On boot, it started working again...