CefSharp: strange behaviour?

Question

I am trying to create an application that uses CefSharp. The application changes proxies every 10 seconds using the code shown below.

Cef.UIThreadTaskFactory.StartNew(delegate {
    var rc = _browser.GetBrowser().GetHost().RequestContext;
    var v = new Dictionary<string, object>();
    v["mode"] = "fixed_servers";
    v["server"] = proxy.ProxyString;
    string error;
    bool success = rc.SetPreference("proxy", v, out error);
});

Now, the proxy wont work for the first few times (3-4), I've actually judged it a few times and its around 3 or 4 times every time. Usually I pick a random proxy from the dictionary, then remove it from the dictionary once received in IP:PORT format.

Now, I thought it was a bit strange how it wouldnt work for the first few times and I started to see a pattern. I decided to stop returning random proxies and return the same ones. I then decided to wait until I saw one that worked, replaced my whole proxy list with that 1 proxy and rebooted my application to just see if it were some of the proxies.

It did the exactly same thing, it didn't work, OnLoadingStateChangedAsync didn't fire where as 3 attempts later (On the SAME proxy), it did.

Can someone explain this strange behaviour in Cefsharp? I'm using Offscreen version of Cefsharp

Better overview of the code:

while (true)
{
    if (_isWorking && _browser.IsBrowserInitialized)
    {
        if ((DateTime.Now - _lastProxyChange).TotalSeconds >= 10)
        {
            // random proxy 
            var proxy = Program.GetServer().GetBaseHandler().GetProxyHandler().GetProxy();

            if (proxy != null)
            {
                Logger.Trace("[#" + _slaveIdentifier + "] Connecting to a new proxy [" + proxy.ProxyString + "]...");

                Cef.UIThreadTaskFactory.StartNew(delegate {
                    var rc = _browser.GetBrowser().GetHost().RequestContext;
                    var v = new Dictionary<string, object>();
                    v["mode"] = "fixed_servers";
                    v["server"] = proxy.ProxyString;
                    string error;
                    bool success = rc.SetPreference("proxy", v, out error);
                });

                _browser.Reload();
            }
            else
            {
                Logger.Warn("Failed to change proxy, none avalible.");
            }

            _lastProxyChange = DateTime.Now;
        }
    }

    if (_isWorking || !_browser.IsBrowserInitialized || Program.GetServer() == null || Program.GetServer().GetBaseHandler() == null)
    {
        continue;
    }

    StartWork();
}

This is also my OnLoadingStateChangedAsync method.

private void OnLoadingStateChangedAsync(object sender, LoadingStateChangedEventArgs args)
{
    try
    {
        if (!args.IsLoading)
        {
            if (_browser.Address == BrowserUtilities.LoginPage)
            {
                OnLoginPage();
            }
            else if (_browser.Address.StartsWith(BrowserUtilities.LoginChallenge))
            {
                OnLoginChallenge();
            }
            else
            {
                Logger.Warn("Something else: " + _browser.Address);
            }
        }
    }
    catch (Exception e)
    {
        Logger.Error(e);
    }
    finally
    {
    }
}

Here is also my console output, showing the pattern:

  05:58:34 - [#0] Connecting to a new proxy [46.36.65.10:3128]...
  05:58:38 - [#0] Connecting to a new proxy [46.36.65.10:3128]...
  05:58:42 - [#0] Connecting to a new proxy [46.36.65.10:3128]...
  05:58:46 - [#0] Connecting to a new proxy [46.36.65.10:3128]...
  05:58:46 - Something else: https;//example.com/
  05:58:47 - Something else: https;//example.com/
  05:58:47 - Something else: https;//example.com/
  05:58:47 - Something else: https;//example.com/
  05:58:47 - Something else: https;//example.com/
  05:58:47 - Something else: https;//example.com/
  05:58:47 - Something else: https;//example.com/
  05:58:47 - Something else: https;//example.com/
  05:58:47 - Something else: https;//example.com/
  05:58:47 - Something else: https;//example.com/
  05:58:47 - Something else: https;//example.com/
  05:58:47 - Something else: https;//example.com/
  05:58:48 - Something else: https;//example.com/
  05:58:50 - [#0] Connecting to a new proxy [46.36.65.10:3128]...
  05:58:50 - Something else: https;//example.com/
  05:58:51 - Something else: https;//example.com/
  05:58:52 - Something else: https;//example.com/
  05:58:54 - [#0] Connecting to a new proxy [46.36.65.10:3128]...
  05:58:54 - Something else: https;//example.com/
  05:58:55 - Something else: https;//example.com/
  05:58:56 - Something else: https;//example.com/