dhcpcd refreshing lease very often.

[Mike Pumford <mpumford%mudcovered.org.uk@localhost>]

Running 9.0-STABLE buit July 26th.

Machine is refreshing its least approximately once a minute. Despite the 
DHCP server being configured with a lease time as follows:
max-lease-time 43200;
default-lease-time 43200;

Server is NetBSD 8.2-STABLE isc dhcpd and this is the only host of many 
on the network refreshing that often.

Only non default option on the client is
slaac hwaddr as I don't actually want the machine to have a privacy 
address as it just makes life hard from an RDNS perspective.

Anything I need to look at to help with debugging this?

Mike