External geolocation request failing with an 'unauthorized' error

We are using Here (previously Navteq) for geolocation and reverse geolocation requests on two domains, both pointing to the same site and both served through Cloudflare. We found that requests through one site suddenly stopped working. In the developer Console of the browser I could see that an “Unauthorized” 401 error code was being returned. When I refreshed the Cloudflare cache of the non-working site, the issue was resolved. Is there something I can do to insure that this problem does not recur?