Dell Powerconnect 70xxP - DHCP issues

OK, Spiceheads experts. Scenario is this

8 Dell PowerConnect 7048P switches in a cluster. Cluster is stacked together with stacking modules and cables. A number of different VLANS and subnets, all inter vlan routing works a treat along with dot1x authentication.

The switch is configured to supply DHCP for each of the VLANs configured.

This is pretty much the same configuration as we had with our old CISCO kit (which is now around 12 years old - and served us well).

So a snippet of the config is as follows

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service dhcp ip dhcp ping packets 10 ip dhcp excluded-address 192.168.70.1 192.168.70.100 ip dhcp pool "DEVELOPMENT" dns-server 192.168.80.110 192.168.80.111 default-router 192.168.70.1 network 192.168.70.0 255.255.255.0 domain-name development.office001.local.net netbios-node-type b-node netbios-name-server 192.168.80.110 192.168.80.111 exit

So the switch has the management interface for the VLAN (192.168.70.1) and an association with the above subnet but for some reason, the switch gives out IP addresses early in the morning and then stops giving out addresses.

The firmware is 5.1.2.3, the weird thing is that you can see the log entries for the host getting authenticated on the dot1x but the for whatever reason it doesn't want to give out DHCP addresses. The address pool is not full so it's not that that's causing the issue.

Anyone any ideas or do you just not use your switches as a DHCP server?