DHCP Failing after being up for a week

Greetings,
My RB450 is having a strange problem with DHCP. After being on for a week, it offers DHCP addresses to clients, but fails to bind to anything it offers to. A reboot solves the problem.

When the issue is happening the web interface shows:

Address MAC-Address Client-ID Dynamic Status
192.168.88.107 00:17:F2:E7:XX:XX 1:0:17:f2:e7:XX:XX yes offered make-static remove
192.168.88.73 7C:6D:62:36:XX:XX 1:7c:6d:62:36:XX:XX yes offered make-static remove

An Export:
[admin@Indigo Router] /ip dhcp-server> /ip dhcp-server export

sep/21/2010 08:46:47 by RouterOS 4.11

software id = KXU4-AWN8

/ip dhcp-server
add address-pool=default-dhcp authoritative=after-2sec-delay bootp-support=static disabled=no interface=“Access Points” lease-time=8h name=
default
/ip dhcp-server config
set store-leases-disk=5m
/ip dhcp-server network
add address=192.168.88.0/24 comment=“default configuration” dns-server=208.67.222.222,208.67.220.220 gateway=192.168.88.1

Any ideas?

Make a supout.rif and send it to support@mikrotik.com.