OnMessageAsync引发的C＃Azure Service Bus多个异常

Question

我一直在实现一个响应OnMessageAsync的侦听器。这完全符合预期，但在调试源中它会不断触发这些异常：

Exception thrown: 'System.ServiceModel.FaultException`1' in Microsoft.ServiceBus.dll
Exception thrown: 'System.ServiceModel.FaultException`1' in Microsoft.ServiceBus.dll
Exception thrown: 'System.ServiceModel.FaultException`1' in Microsoft.ServiceBus.dll
Exception thrown: 'System.ServiceModel.FaultException`1' in Microsoft.ServiceBus.dll
Exception thrown: 'System.ServiceModel.FaultException`1' in Microsoft.ServiceBus.dll
Exception thrown: 'System.TimeoutException' in Microsoft.ServiceBus.dll

这组6个异常似乎每分钟触发一次。有谁知道为什么这些触发器或究竟是什么导致这些异常？

代码段：

OnMessageOptions options = new OnMessageOptions
{
    MaxConcurrentCalls = 5,
    AutoComplete = false
};

QueueClient client = QueueClient.CreateFromConnectionString(inboundConnectionString, ReceiveMode.PeekLock);
client.OnMessageAsync(async m =>
{
    try
    {
        await ProcessMessageAsync(m);
        ...
    }
    ...
}, options);

AutoRenewTimeout似乎没有对OnMessageOptions产生影响。