When we scrape a public professional networks profile for example with our Person Profile API, we are served with a temporary CDN URL by professional networks which usually begins with https://media-exp... Some of our customers store the temporary CDN URL which expires in an unpredictable manner. To prevent this, we have taken to temporarily cache the images so that the links to the pictures persist in a predictable fashion. To be precise, 30 minutes.
This is by design so developers can handle images by downloading them instead of relying on unreliable CDN URLs.
The recommended approach to these temporal links is to download the image via the URL returned from our API as soon as we return the response and host the image on your end.