spout doesnt send messages to first bolt

[Velatorre ve la tor]

Hi,
my name is Velatorre and i need your help.
I'm using a Storm topology with 1 spout in Java and 4 bolts in Python.
it works well when the topology starts but when it has been working for a
while, bolts stop and never work. Spout continues feeding the topology but
storm doesn't start the bolts again.
It may be a problem of deadlock?

Thanks.