ASP.NET Crash. Invalid token for impersonation - it cannot be duplicated.

HomeController.cs

using System;
using System.Data.SqlClient;
using System.Diagnostics;
using System.Security.Principal;
using System.Threading;
using System.Web.Mvc;

public class HomeController : Controller
{
    static Timer timer = new Timer(_ =>
    {
      try
      {
          // https://social.msdn.microsoft.com/Forums/en-US/55c24ac5-b051-4559-bb3d-9cfba8f8c9ef/updated-invalid-token-for-impersonation-it-cannot-be-duplicated        
          // http://stackoverflow.com/questions/8993293/windowsidentity-impersonate-in-asp-net-randomly-invalid-token-for-impersonation
          // https://support.microsoft.com/en-us/kb/982262
          // run this in IIS with Windows authentication (not sure whether it's required)
          // this crashes eventually when serializing the windows identity from the LogicalCallContext.Principal
          // that identity is disposed by System.Web.RootedObjects.ReleasePrincipal
          // setting the principal to null avoids the problem
          //Thread.CurrentPrincipal = null;
          // do remoting work
          SqlDependency.Start("connection string");
          Trace.WriteLine("OK " + Thread.CurrentPrincipal.Identity.IsAuthenticated);
      }
      catch(Exception ex)
      {
          Trace.WriteLine(ex);
      }
    }, null, 0, 1000);
    
    public ActionResult Index()
    {
      return View();
    }
}