I have a customer who is facing exactly similar behaviour described in https://bugzilla.redhat.com/show_bug.cgi?id=1973424 on the current latest OCP 4.8.10 version on RHEV using IPI.

- Here is how the customer's install-config.yaml networking looks like:

~~~
    networking:
      clusterNetwork:
      - cidr: 172.20.0.0/14
        hostPrefix: 23
      machineNetwork:
      - cidr: 192.168.130.192/26
      networkType: OpenShiftSDN
      serviceNetwork:
      - 172.24.0.0/16
~~~
- And the VIPs are:

~~~
        api_vip: 192.168.130.213
        ingress_vip: 192.168.130.214
~~~

- The VIPs are initially attached to bootstrap node and as soon as the master nodes come up, the VIPs moved to one of the masters which results in a connection refused over API port 6443. However, the apiserver runs fine on the bootstrap node and I could curl it using localhost. 

- In the bootstrap's keepalived container logs, we could see the APIs being removed:

~~~
Wed Sep  8 15:58:44 2021: Stopping
Wed Sep  8 15:58:44 2021: (API) sent 0 priority
Wed Sep  8 15:58:44 2021: (API) removing VIPs.
Wed Sep  8 15:58:45 2021: Stopped - used 0.053487 user time, 0.088436 system time
Wed Sep  8 15:58:45 2021: CPU usage (self/children) user: 0.003939/0.056966 system: 0.005913/0.090383
Wed Sep  8 15:58:45 2021: Stopped Keepalived v2.1.5 (07/13,2020)
~~~

Version:

$ openshift-install version
4.8.10

Platform:

#Please specify the platform type: libvirt

* IPI (automated install with `openshift-install`. If you don't know, then it's IPI)

Anything else we need to know?

As requested in https://bugzilla.redhat.com/show_bug.cgi?id=1973424#c16 comment#16, I am opening this BZ. 

It appears that one for master nodes (master-0) didn't ignite correctly, 

so the etcd-operator didn't reach 3 healthy nodes:

from the etcd-operator log:
2021-09-09T16:28:39.784734070+00:00 stderr F E0909 16:28:39.784702       1 envvarcontroller.go:205] key failed with : can't update etcd pod configurations because scaling is currently unsafe: 3 nodes are required, but only 2 are available