oc-mirror plugin fails with catalog is invalid and 401 unauthorized error when it hangs for few minutes in RHOCP 4

Issue

• Mirroring images for a disconnected environment using oc-mirror plugin gets hung and then getting failed.
• Even though the registry credentials are good as per oc-mirror in a disconnected environment fails with a "HTTP 401 Unauthorized" error, mirroring is getting failed.
• Usually the error occurs in between the mirroring while it is not able to get an image in a specified time limit.

• The mirror fails with the following messages:

  The rendered catalog is invalid.
  

  error: error rendering new refs: render reference "registry.redhat.io/redhat/redhat-operator-index:v4.12": error resolving name : pulling from host registry.redhat.io failed with status code [manifests v4.12]: 401 Unauthorized