YAM REST API CORS error: Cross-origin request blocked: Same origin policy forbids reading remote resource

We are working with Yammer REST API and sometimes we get below exceptions and are unable to complete requests.

Cross-origin request blocked: Same origin policy prevents reading the remote resource at https://api.yammer.com/api/v1/users/followed_by/XXX.json?&_=XXX . This can be fixed by moving the resource to the same domain or by enabling CORS.

we added the website url to the beginning of the javascript. This is seen in IE and Firefox as well.

@ Yammer team: could you please check. Thank.