Can not authorise user in Facebook JS SDK : "This authorization code has been used." or how to get new authorisation token?

I am trying to use Facebook to authenticate users. It works ok except for Ajax calls. Most of the times it just send old token and I get :

{"error":{"message":"This authorization code has been used.","type":"OAuthException","code":100}}

So what I tried doing is wrapping every ajax call with

FB.getLoginStatus(function(response) {
        if (response.status === 'connected') {
            return  fn();
            ...

this did not worked so I've added : true as parameter to getLoginStatus to prevent caching :

FB.getLoginStatus(function(response) {
        if (response.status === 'connected') {
            console.log('connected');
            fn();
        } else if (response.status === 'not_authorized') {
            console.log('not_authorized);
        } else {
            console.log('not_logged_in');
        }
    },true);

Great! Except it is terribly slow. Am I doing something wrong? Can I get new token after each action so I do not need to wait before the next one?

Thanks W