Puppet users - Mar 2014 - certificates being 'randomly' revoked

Hi,
I've been having issues with certificates being revoked without any human 
intervention or oversight; one day a node will try to do an update and it 
can't because its certificate is revoked.

There is definitely no one issuing 'puppet cert clean nodename' on the 
commandline.

puppet --version
3.4.3

any ideas? Is there some automated process that 'cleans' and revokes
nodes
that are 'too old'?

I'd like to have control over this and have absolutely no automated system 
revoking certificates at all.

Thanks.

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