I have several machines in just ONE location that are resetting GUIDs continuously. They seem to have duplicate GUIDs.
I uninstalled and reinstalled the agent (as well as cleaning the registry) on three different machines and this is still happening.
SMP logs show:
Host Resource <GUID of Computer> shares GUID with another machine: HOSTNAME.domain.COM. The resource must change its GUID
Add duplicate computer resources to the blacklisted hosts' list
Preconfigured MDM registry setting on newly added computers causing merging based on wmdm_device_id resource key.
MDM was not configured or used in Altiris.
Deleted HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Provisioning\OMADM\MDMDeviceID on devices in the newly added site/location.