openshift-apiserver degraded and kube-apiserver not available in OCP 4

Issue

• The openshift-apiserver Cluster Operator is degraded or not available:

  $ oc get co openshift-apiserver
  NAME                 VERSION  AVAILABLE  PROGRESSING  DEGRADED  SINCE
  openshift-apiserver  4.5.24   False      False        False     1h11m
  

• There are "panic" errors in the kube-apiserver pods:

  2021-01-01T00:00:00.000000000Z E0101 00:00:00.000000      18 runtime.go:78] Observed a panic: &errors.errorString{s:"killing connection/stream because serving request timed out and response had been started"} (killing connection/stream because serving request timed out and response had been started)
  

• The status of the openshift-apiserver Cluster Operator has the following message:

  - lastTransitionTime: '2021-01-29T02:27:11Z'
    message: 'APIServicesAvailable: "apps.openshift.io.v1" is not ready: 0 (Get https://10.205.0.1:443/apis/apps.openshift.io/v1?timeout=32s: context deadline exceeded (Client.Timeout exceeded while awaiting headers))
  
      APIServicesAvailable: "authorization.openshift.io.v1" is not ready: 0 (Get https://10.205.0.1:443/apis/authorization.openshift.io/v1?timeout=32s:
    net/http: request canceled (Client.Timeout exceeded while awaiting headers))
  
      APIServicesAvailable: "build.openshift.io.v1" is not ready: 0 (Get https://10.205.0.1:443/apis/build.openshift.io/v1?timeout=32s:
    context deadline exceeded (Client.Timeout exceeded while awaiting headers))
  
      APIServicesAvailable: "image.openshift.io.v1" is not ready: 0 (Get https://10.205.0.1:443/apis/image.openshift.io/v1?timeout=32s:
    net/http: request canceled (Client.Timeout exceeded while awaiting headers))
  
      APIServicesAvailable: "oauth.openshift.io.v1" is not ready: 0 (Get https://10.205.0.1:443/apis/oauth.openshift.io/v1?timeout=32s:
    context deadline exceeded (Client.Timeout exceeded while awaiting headers))
  
      APIServicesAvailable: "project.openshift.io.v1" is not ready: 0 (Get https://10.205.0.1:443/apis/project.openshift.io/v1?timeout=32s:
    context deadline exceeded (Client.Timeout exceeded while awaiting headers))
  
      APIServicesAvailable: "quota.openshift.io.v1" is not ready: 0 (Get https://10.205.0.1:443/apis/quota.openshift.io/v1?timeout=32s:
    net/http: request canceled (Client.Timeout exceeded while awaiting headers))
  
      APIServicesAvailable: "route.openshift.io.v1" is not ready: 0 (Get https://10.205.0.1:443/apis/route.openshift.io/v1?timeout=32s:
    context deadline exceeded)
  
      APIServicesAvailable: "security.openshift.io.v1" is not ready: 0 (Get https://10.205.0.1:443/apis/security.openshift.io/v1?timeout=32s:
    net/http: request canceled (Client.Timeout exceeded while awaiting headers))
  
      APIServicesAvailable: "template.openshift.io.v1" is not ready: 0 (Get https://10.205.0.1:443/apis/template.openshift.io/v1?timeout=32s:
    context deadline exceeded (Client.Timeout exceeded while awaiting headers))
  
      APIServicesAvailable: "user.openshift.io.v1" is not ready: 0 (Get https://10.205.0.1:443/apis/user.openshift.io/v1?timeout=32s:
    net/http: request canceled (Client.Timeout exceeded while awaiting headers))'
    reason: APIServices_Error
    status: 'False'
    type: Available
  

• Error "Client.Timeout exceeded while awaiting headers" in several pods:

  2021-01-29T03:28:34.330074737Z I0129 03:28:34.330006       1 event.go:278] Event(v1.ObjectReference{Kind:"Deployment", Namespace:"openshift-apiserver-operator", Name:"openshift-apiserver-operator", UID:"c9ab82de-7fbe-11ea-ac8b-005056b2e4b3", APIVersion:"apps/v1", ResourceVersion:"", FieldPath:""}): type: 'Warning' reason: 'OpenShiftAPICheckFailed' "oauth.openshift.io.v1" failed with HTTP status code 0 (Get https://10.205.0.1:443/apis/oauth.openshift.io/v1?timeout=32s: net/http: request canceled (Client.Timeout exceeded while awaiting headers))