Clicking on link freezes the app

I'm using Xamarin.TTTAttributedLabel to parse HTML in xamarin.ios app. Most of the times, whenever I click on the link it freezes the app. Sometimes it works and sometimes it doesn't. I'm using Label inside UIView --> ScrollView. My scrollview doesn't have any tap gesture. This doesn't happen on simulator. Only on physical device.

View.AddSubview (scrollView)
TTTAttributedLabel lbl = new TTTAttributedLabel();
lbl.SetText(attributedString, 15f);
lbl.Lines = 0;
lbl.EnabledTextCheckingTypes = NSTextCheckingType.Link | NSTextCheckingType.PhoneNumber;
lbl.UserInteractionEnabled = true;
lbl.Delegate = new TTTHTMLLabelDelegate(this);
lbl.Frame = new CGRect (15, 0, Common.screenWidth - 30, 20);
lbl.SizeToFit();
view2.AddSubview(lbl);
scrollView.AddSubview(view2);



//Delegate code
public override void DidSelectLinkWithURL(TTTAttributedLabel label, NSUrl url)
        {
            if (url != null)
            {
                var PageUrl = url.ToString();
                if (!string.IsNullOrWhiteSpace(PageUrl))
                {
                    if (PageUrl.StartsWith("mailto"))
                    {
                        //code to open email app
                    }
                    else if (PageUrl.StartsWith("tel"))
                    {
                       //code to open phone app

                    }
                    else
                    {
                        //for <a> links
                        UIApplication.SharedApplication.OpenUrl(url)
                    }
                }
            }

        }

UPDATED with sample code. I have observed one more thing, DidSelectLinkWithURL not get called when app freezes.

Try to store your variable

public class YourClass
{
TTTAttributedLabel lbl;

 ViewDidLoad()
 {
       View.AddSubview (scrollView)
       lbl = new TTTAttributedLabel();
       lbl.SetText(attributedString, 15f);
       lbl.Lines = 0;
       lbl.EnabledTextCheckingTypes = NSTextCheckingType.Link | 
       NSTextCheckingType.PhoneNumber;
       lbl.UserInteractionEnabled = true;
       lbl.Delegate = new TTTHTMLLabelDelegate(this);
       lbl.Frame = new CGRect (15, 0, Common.screenWidth - 30, 20);
       lbl.SizeToFit();
       view2.AddSubview(lbl);
       scrollView.AddSubview(view2);
 }
}