Hi,
Is this affecting only the VM's on a particular UCS server? Do you have CUCM or other UC VM's on a diff UCS that are part of the same cluster and not exeperiencing this error?
This is definitely not working as designed, you may need to engage TAC to check from Cisco side and probably VMware support as well if UC/UCS side of the troubleshooting is unable to find anything concrete.
Manish