Fast color mapping bug

using System.Drawing;
using System.Threading.Tasks;
using Colorful;
using Console = System.Console;

namespace Demo
{
    class Program
    {
        private static bool _isRunning = true;

        static void Main(string[] args)
        {
            Task.Factory.StartNew(() =>
            {
                while (true)
                {
                    if (!_isRunning) break;
                    WriteRandom();
                }
            });


            Task.Factory.StartNew(() =>
            {
                while (true)
                {
                    if (!_isRunning) break;
                    WriteRandom();
                }
            });

            Task.Factory.StartNew(() =>
            {
                while (true)
                {
                    if (!_isRunning) break;
                    WriteRandom();
                }
            });

            Console.ReadKey();
            _isRunning = false;
            Console.ReadKey();
        }

        static void WriteRandom()
        {
            var dream = "a dream of {0} and {1} and {2} and {3} and {4} and {5} and {6} and {7} and {8} and {9}...";
            Formatter[] fruits =
            {
                new Formatter("bananas", Color.LightGoldenrodYellow),
                new Formatter("strawberries", Color.Pink),
                new Formatter("mangoes", Color.PeachPuff),
                new Formatter("pineapples", Color.Yellow),
                new Formatter("cherries", Color.Red),
                new Formatter("oranges", Color.Orange),
                new Formatter("apples", Color.LawnGreen),
                new Formatter("peaches", Color.MistyRose),
                new Formatter("plums", Color.Indigo),
                new Formatter("melons", Color.LightGreen),
            };
            Colorful.Console.WriteLineFormatted(dream, Color.Gray, fruits);
        }
    }
}