线程被中止-C#正在使用队列

我们已经实现了一个将文件上传到box.net的队列。所有文件都已成功上载。但是，我在一周内会出现以下异常1到2次。我找不到任何原因造成这种异常。

异常消息：

线程正在中止。

异常来源：

mscorlib

异常StackTrace:

在System.Threading.Monitor.OjWait（布尔exitContext，Int32毫秒超时，对象obj）在System.Threading.Monitor.Wait（对象obj，Int32毫秒超时，布尔exitContext）在System.Threading.Monitor.Wait（对象obj）位于C:''Project''BackupProjects''BoxNetFileUpload''Box.netAPIWebApp''Source''Service''BoxService.cs:line 90 中的Box.netAPI WebApp.Service.BoxService.monitorOnUploadQueue（）

有人能帮上忙吗？

private static readonly BoxService instance = new BoxService();
private Queue<FileCabinetUploadHistory> uploadQueue = new Queue<FileCabinetUploadHistory>();

private BoxService()
{
    Thread monitorThread = new Thread(new ThreadStart(monitorOnUploadQueue));
    monitorThread.Start();
}
private FileCabinetUploadHistory RemoveFromUploadQueue()
{
    lock (uploadQueue)
    {
        return uploadQueue.Dequeue();
    }
}
private void monitorOnUploadQueue()
{
    FileCabinetUploadHistory fileCabinetUploadHistory = null;
    try
    {
        while (true)
        {
            if (uploadQueue.Count < 1)
            {
                lock (uploadQueue)
                {
                    Monitor.Wait(uploadQueue);
                }
            }
            fileCabinetUploadHistory = uploadQueue.Peek();
            if (fileCabinetUploadHistory != null)
            {
                StartFileUpload(fileCabinetUploadHistory);
            }
        }
    }
    catch (Exception exception)
    {
        log.Error("Error:--> Class name: BoxService, Method name: monitorOnUploadQueue() 'n", exception);
    }
}
public void AddToUploadQueue(FileCabinetUploadHistory fileCabinetUploadHistory)
{
    lock (uploadQueue)
    {
        if (!uploadQueue.Contains(fileCabinetUploadHistory))
        {
            uploadQueue.Enqueue(fileCabinetUploadHistory);
            Monitor.Pulse(uploadQueue);
        }
    }
}