Seeing server errors when using the API

I am trying to clear a CDN cache via the API following this documentation (https://developers.digitalocean.com/documentation/v2/#purge-the-cache-for-an-existing-cdn-endpoint) and this code:

DELETE https://api.digitalocean.com/v2/cdn/endpoints/{{ endpoint }}/cache HTTP/1.1
Authorization: Bearer {{auth_token}}
Content-Type: application/json
Accept: application/json

{
    "files": [
        "uploads/staging/youth/en-gb/3_YOUTH_en-GB.mp3"
    ]
}

What I am seeing is that the request returns the expected 204 status and the cache is cleared when the cache is set, but when the cache is clear already (or at some other random times that I haven’t figured out yet) the request returns a 500 server error. From my testing, it looks like when this happens, the cache was not cleared.

Has anyone experienced this and / or can give some advice?

Thanks!