OpenShift API stops responding to requests / is unreachable multiple times during z-upgrade

Issue

• OpenShift API stops responding to requests / is unreachable multiple times during z-upgrade.
• Console not available during upgrade :

2020-04-22T10:02:50.630674139Z E0422 10:02:50.630309       1 status.go:73] OAuthClientSyncDegraded FailedGet oauth client for console does not exist and cannot be created (the server is currently unable to handle the request (get oauthclients.oauth.openshift.io console))
2020-04-22T10:02:50.643477365Z I0422 10:02:50.643429       1 status_controller.go:165] clusteroperator/console diff {"status":{"conditions":[{"lastTransitionTime":"2020-03-31T10:52:18Z","message":"OAuthClientSyncDegraded: oauth client for console does not exist and cannot be created (the server is currently unable to handle the request (get oauthclients.oauth.openshift.io console))","reason":"AsExpected","status":"False","type":"Degraded"},{"lastTransitionTime":"2020-04-22T09:16:20Z","reason":"AsExpected","status":"False","type":"Progressing"},{"lastTransitionTime":"2020-04-22T09:56:33Z","reason":"AsExpected","status":"True","type":"Available"},{"lastTransitionTime":"2019-08-27T10:42:47Z","reason":"AsExpected","status":"True","type":"Upgradeable"}]}}
2020-04-22T10:02:50.644945969Z E0422 10:02:50.644417       1 controller.go:129] {Console Console} failed with: oauth client for console does not exist and cannot be created (the server is currently unable to handle the request (get oauthclients.oauth.openshift.io console))
2020-04-22T10:02:50.656132494Z I0422 10:02:50.656078       1 event.go:255] Event(v1.ObjectReference{Kind:"Deployment", Namespace:"openshift-console-operator", Name:"console-operator", UID:"5bc9d9f2-c8b7-11e9-ad88-0050569a0aeb", APIVersion:"apps/v1", ResourceVersion:"", FieldPath:""}): type: 'Normal' reason: 'OperatorStatusChanged' Status for clusteroperator/console changed: Degraded message changed from "" to "OAuthClientSyncDegraded: oauth client for console does not exist and cannot be created (the server is currently unable to handle the request (get oauthclients.oauth.openshift.io console))"
2020-04-22T10:02:50.833451934Z I0422 10:02:50.833412       1 status_controller.go:165] clusteroperator/console diff {"status":{"conditions":[{"lastTransitionTime":"2020-03-31T10:52:18Z","reason":"AsExpected","status":"False","type":"Degraded"},{"lastTransitionTime":"2020-04-22T09:16:20Z","reason":"AsExpected","status":"False","type":"Progressing"},{"lastTransitionTime":"2020-04-22T09:56:33Z","reason":"AsExpected","status":"True","type":"Available"},{"lastTransitionTime":"2019-08-27T10:42:47Z","reason":"AsExpected","status":"True","type":"Upgradeable"}]}}
2020-04-22T10:02:50.842785765Z I0422 10:02:50.842731       1 event.go:255] Event(v1.ObjectReference{Kind:"Deployment", Namespace:"openshift-console-operator", Name:"console-operator", UID:"5bc9d9f2-c8b7-11e9-ad88-0050569a0aeb", APIVersion:"apps/v1", ResourceVersion:"", FieldPath:""}): type: 'Normal' reason: 'OperatorStatusChanged' Status for clusteroperator/console changed: Degraded message changed from "OAuthClientSyncDegraded: oauth client for console does not exist and cannot be created (the server is currently unable to handle the request (get oauthclients.oauth.openshift.io console))"