Solaris 11 zones constantly reporting "nwamd now back to running as netadm"

We are creating zones at Solaris 11.1 and are getting syslog messages like the following every second from each zone:

Mar 21 11:40:34 x nwamd[27199]: [ID 309173 daemon.info] 6: nwamd now running as root
Mar 21 11:40:34 x nwamd[27199]: [ID 304677 daemon.info] 6: nwamd now back to running as netadm
Mar 21 11:40:35 x nwamd[27199]: [ID 309173 daemon.info] 6: nwamd now running as root
Mar 21 11:40:35 x nwamd[27199]: [ID 304677 daemon.info] 6: nwamd now back to running as netadm

Our net config is:

# netadm list -x
TYPE        PROFILE        STATE          AUXILIARY STATE
ncp         Automatic      disabled       disabled by administrator
ncp         DefaultFixed   online         active
loc         Automatic      offline        conditions for activation are unmet
loc         NoNet          offline        conditions for activation are unmet