DHCP for VLAN on 4507; IP Conflicts too often

I have seen a few similar posts, but nothing so far that fits my scenario, I think.
I keep getting random users in this VLAN reporting IP conflicts. These desktop systems are left on 24/7. Right now, we only have one VLAN DHCP being served from this core switch.
There are only 29 computers pulling DHCP on this VLAN, but I have a large range allocated to them for growth. These are desktop systems, so they don't swap network ports, and they don't have dual NICs, nor do they have WiFi. So I am at a lose as to why we would be seeing IP conflicts with such an obvious open pool of IPs, and with MAC addresses not changing. It has been my experience that pretty much unless something happens(offline for several days, NIC replacement, etc.) to the MAC every IP renewal gives the same IP back.
Core#sho ip dhcp pool OUR-Workstations
Pool OUR-Workstations :
Utilization mark (high/low)    : 100 / 0
Subnet size (first/next)       : 0 / 0
Total addresses                : 254
Leased addresses               : 28
Excluded addresses             : 49
Pending event                  : none
1 subnet is currently in the pool :
Current index        IP address range                    Leased/Excluded/Total
10.1.32.183          10.1.32.1        - 10.1.32.254       28    / 49    / 254
Core#sho ip dhcp binding
Bindings from all pools not associated with VRF:
IP address      Client-ID/              Lease expiration        Type       State      Interface
                Hardware address/
                User name
10.1.32.50      0180.1f02.5f5e.b6       Dec 18 2013 11:34 PM    Automatic  Active     Vlan32
10.1.32.51      01f0.4da2.2e9f.06       Dec 19 2013 07:57 AM    Automatic  Active     Vlan32
10.1.32.54      01b8.ac6f.45b4.27       Dec 19 2013 09:54 AM    Automatic  Active     Vlan32
10.1.32.55      0100.2564.c8bd.ea       Dec 19 2013 09:33 AM    Automatic  Active     Vlan32
10.1.32.58      01b8.ac6f.45c4.97       Dec 19 2013 04:18 AM    Automatic  Active     Vlan32
10.1.32.61      01b8.ac6f.3693.05       Dec 19 2013 05:12 AM    Automatic  Active     Vlan32
10.1.32.62      01b8.ac6f.35f0.eb       Dec 19 2013 05:18 AM    Automatic  Active     Vlan32
10.1.32.63      0100.2564.c8c7.ae       Dec 19 2013 12:26 AM    Automatic  Active     Vlan32
10.1.32.65      01f0.4da2.2fba.66       Dec 19 2013 01:44 AM    Automatic  Active     Vlan32
10.1.32.66      01b8.ac6f.46eb.b8       Dec 19 2013 01:05 AM    Automatic  Active     Vlan32
10.1.32.67      01b8.ac6f.45c9.7a       Dec 18 2013 10:54 PM    Automatic  Active     Vlan32
10.1.32.68      01b8.ac6f.45c3.dc       Dec 19 2013 07:12 AM    Automatic  Active     Vlan32
10.1.32.70      01b8.ac6f.35f1.48       Dec 19 2013 05:15 AM    Automatic  Active     Vlan32
10.1.32.88      01b8.ac6f.37bc.3e       Dec 19 2013 06:37 AM    Automatic  Active     Vlan32
10.1.32.97      01b8.ac6f.368f.f5       Dec 19 2013 06:42 AM    Automatic  Active     Vlan32
10.1.32.101     01b8.ac6f.45bb.9e       Dec 19 2013 06:17 AM    Automatic  Active     Vlan32
10.1.32.110     01f0.4da2.2d47.5a       Dec 19 2013 06:17 AM    Automatic  Active     Vlan32
10.1.32.118     01f0.1faf.1d37.97       Dec 19 2013 07:19 AM    Automatic  Active     Vlan32
10.1.32.121     0100.2564.c95a.c1       Dec 19 2013 06:53 AM    Automatic  Active     Vlan32
10.1.32.144     01b8.ac6f.1d37.34       Dec 19 2013 09:16 AM    Automatic  Active     Vlan32
10.1.32.167     0100.2564.c94e.f0       Dec 19 2013 07:34 AM    Automatic  Active     Vlan32
10.1.32.170     01e0.db55.e9d7.01       Dec 19 2013 07:38 AM    Automatic  Active     Vlan32
10.1.32.171     0100.03ff.2eba.66       Dec 18 2013 01:20 PM    Automatic  Active     Vlan32
10.1.32.178     0124.7703.f1c2.e5       Dec 18 2013 10:02 AM    Automatic  Selecting  Vlan32
10.1.32.235     01f0.4da2.2c92.33       Dec 19 2013 09:53 AM    Automatic  Active     Vlan32
10.1.32.238     01b8.ac6f.3649.aa       Dec 19 2013 05:21 AM    Automatic  Active     Vlan32
10.1.32.241     01b8.ac6f.1d2a.2f       Dec 18 2013 10:08 PM    Automatic  Active     Vlan32
10.1.32.247     01b8.ac6f.45b5.8f       Dec 19 2013 05:15 AM    Automatic  Active     Vlan32
Not sure what the SELECTING status is for 10.1.32.178, but I assume I caught this at a point IP renewal.
Core#sho ip dhcp server stat
Memory usage         22449
Address pools        1
Database agents      0
Automatic bindings   28
Manual bindings      0
Expired bindings     1178
Malformed messages   294
Secure arp entries   0
Renew messages       2368
Relay bindings                 0
Relay bindings active          10
Relay bindings terminated      0
Relay bindings selecting       10
Message              Received
BOOTREQUEST          171602
DHCPDISCOVER         2931675
DHCPREQUEST          2680462
DHCPDECLINE          271
DHCPRELEASE          26
DHCPINFORM           951950
DHCPVENDOR           0
BOOTREPLY            0
DHCPOFFER            126
DHCPACK              0
DHCPNAK              0
Message              Sent
BOOTREPLY            0
DHCPOFFER            8196
DHCPACK              353198
DHCPNAK              12769
Message      Forwarded
BOOTREQUEST          0
DHCPDISCOVER         0
DHCPREQUEST          0
DHCPDECLINE          0
DHCPRELEASE          0
DHCPINFORM           0
DHCPVENDOR           0
BOOTREPLY            0
DHCPOFFER            0
DHCPACK              0
DHCPNAK              0

Hi,
Cisco IOS DHCP service doesn't reallocate the same IP to a client that is renewing its binding, it will try to offer the next IP available that is not excluded manually or that either didn't receive a DHCPDECLINE or a positive reply to an icmp echo test or ARP test.It will circle like this upto end of pool and starting at start of pool again.
Regards
Alain
Don't forget to rate helpful posts.

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    Root bridge selection is only used to control which paths are blocked if any. The actual path of the traffic does not have to pass via the root bridge. It will always take the most direct path between the machines.
    It is much more important to see where the blocked link is if you have any.
    As a example you have a distribution switch connected to your 2 core switches and the 2 core switches connected to each other. You design you spanning tree to block the link between the 2 core switches by setting the cost very high. In this case any machine on the distribution switch can directly access either core switch. Since only the core switch that is the active HSRP router for a vlan will advertise the common mac address the distribution switch will only see the mac address on one of the two links. Either core switch can be set as the root but the traffic will alway directly flow to the active HSRP device.
    Of course you don't want to block the line between the switches because the HSRP keepalive message will be layer 2 routed via the distribution switch. In a very simple design it is common to have the root bridge be the HSRP active device just because its easier to configure but the concepts are not really related. Root bridge placement is more related to traffic volumes than anything else it just tends to be true that the switch has the gateway is also the highest volume of traffic

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