Intermittent HResult erros in Excel Operations

Scenario: When performing excel operations intermittently HResult exceptions thrown in various places like reading and writing.

Steps to reproduce:

Current Behavior: HResult errors

Expected Behavior: Should work without error

Studio/Robot/Orchestrator Version: Latest

Last stable behavior:
Last stable version:
OS Version:Win7
Others if Relevant: (workflow, logs, .net version, service pack, etc):