C# Azure Service Bus Multiple Exceptions Thrown For OnMessageAsync

Question

i've been implementing a listener that responds to an OnMessageAsync. This works exactly as intended but in the debug feed it continually triggers these exceptions:

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

This set of 6 exceptions seem to trigger every minute. Does anyone know why these trigger or what exactly is causing these exceptions?

code snippet:

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 doesn't seem to make a difference in OnMessageOptions.