I also had issues in my homelab and I was being able to replicate the issue.

I basically setup all my 4 DNS servers in the vCenter configuration wizard (2nd step) and 2 of them were Powered off.

I could say that it's best to setup the vCenter with just one DNS server and then to reconfigure it with the others.

For NTP settings, I chose to sync the vCenter with the local ESX but previously I was using pool.ntp.org.

This might be also causing issues but I doubt.