Send HTTP Request to Sharepoint: Delete File Action Fails Intermittently (Status 401: Unauthorized)

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I have a Flow that runs 2x/hr so it gets lots of action. One of the Actions is to delete old image files in a Sharepoint on-prem doc library. This action fails intermittently with no clear reason why.

How do I troubleshoot and fix this?

Example:

- DELETE_old_image action has 77 iterations in a loop

- Iteration 1-7 work just fine

- Iteration 8-16 fail with "Unauthorized"

- Iteration 17-77 work just fine

Why is this happening and how do I fix it?