[Twisted-Python] Why is stopProducing() called?

[Gabriel Rossetti]

Hello,

I keep on getting stopProducing()  called on my push producer (yes, I'm 
going to try it anyways). From what I read, that means that the consumer 
died, correct? What can make the consumer die? My consumer is a TCP/IP 
transport and all my tests are done through the loopback interface, thus 
the network can't be down, any ideas?

Gabriel