Update after XP machines had DHCP removed.
The problem disappeared! No issue with Cisco config and setup it is an issues with XP running on Hyper-V requesting DHCP.
We never managed to capture the fault as it happened, however, giving XP machines a static IP stopped all the symptoms displayed on the Cisco phones and switches.
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I have an issues where laptops running Microsoft Hyper-V connect to Cisco 7941 handsets. This is causing no end of problems across the estate including phones registering on the data vlan, phone stuck in reboot cycle, phones not registering in CDP, loss of corporate directory......
Can Cisco equipment work in such a manner? Cisco TAC could not see any issues with versions or configuration on the Cisco equipment.
My understanding is that there should only be one MAC and one IP address associated with the phone's PC port.
The only solutions I can think of are; remove the phones and connect the Hyper-V laptops directly to the switch, or, set the Hyper-V laptop virtual switch to use PAT [https://charbelnemnom.com/2016/05/how-to-configure-hyper-v-virtual-switch-that-supports-nat-network-with-powershell-hyperv-powershell/]
Any assistance or suggestions gratefully received before my network melts down completely.
Hyper-V: Windows 10 & Windows XP
Cisco 7941: 9.4SR
Cisco 3750: 12.2(55)
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