VM NIC keeps changing from Dynamic to Static IP (from a static IP pool)

Back ground:
Having migrated our VM's from 2008R2 and 2012SP1 servers into one 4 node 2012R2 Hyper V Cluster we have a problem with NIC's being changed to Static IP, this in turn gives a range of warning and errors when
moving VM's between the nodes (example during a live migrate or when we put a node in maintenance mode).
The cluster share a Logical Switch, this switch has 1 Uplink. The uplink is a Port Profile called "TrunkPort" and it contains lots of network sites. Each network site links to a Logical Network, each Logical Network is basically a VLAN on our Cisco
router/switch.
We don't have any IP Pools configured since we assign all VM's a static IP manually or they use DHCP provided by our AD servers.
When we change a NIC to from Static IP to Dynamic (there might be power shell to do this), bit in the GUI its painfull as you have to shutdown the VM remove the adapter and create a new one. I does not last long as the system after a few minutes changes
the NIC configuration back to Static IP again. Any idea why and how to stop it?
example of errors after a migration that completed w/ Info :
Error (23801)
No available connection to selected VM Network can be found.
Recommended Action
Ensure host NICs have connection to the fabric network on which VM Network is created.
Error (23810)
There is no host NIC with required classification.
Recommended Action
Ensure that there NICs with required classification on a host.
Error (23806)
All available ports on switch extension has been used.
Recommended Action
Ensure there are free ports available on a switch extension.
Error (23808)
All available ports on port profile has been used.
Recommended Action
Ensure that there are free ports available on a port profile.
Error (23807)
The switch extension has reached maximum supported ports on this host.
Recommended Action
Ensure there are free ports available on a switch extension per host.
Error (23809)
The port profile has reached maximum supported ports on this host.
Recommended Action
Ensure that there are free ports available on a port profile per host.
Error (23825)
The virtual machine requires a logical switch connection and the host network adapter is not attached to a logical switch or operating system doesn't support logical switch.
Recommended Action
Ensure operating system supports logical switch and there is a logical switch connection for the host or remove the network interface card from the virtual machine and try the operation again.
Error (23753)
The virtual machine or tier load balancer configuration requires an IP pool and there are no appropriate IP pools accessible from the host.
Recommended Action
Select a host with access to an appropriate IP pool and try the operation again.
Warning (23830)
Unable to find compliant logical switch.
Recommended Action
Fix logical switch compliance state.
Note: a server configured with Dynamic NIC will move between nodes without any errors (nice green tick box icon), our problem is that SCVMM or the servers deside to reconfigure the NIC's to Static IP when ever they see fit!!

I feel like some issue with the Fabric configuration.
If you are create a new VM through SCVMM, do you face this issue? (While creating the new VM, on the hardware configuration page, use dynamic IP and Dynamic MAC)
The first event which you listed says about missing VM Network.
No available connection to selected VM Network can be found.
Please check the VM Network to where the VM is connected through SCVMM. And check if all the nodes have the same VM Network.
If thats missing, fixing it might fix few other errors which you mentioned.
Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence.
InsideVirtualization.com

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VM NIC keeps changing from Dynamic to Static IP (from a static IP pool)

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