Frozen pyds

I've been having problems where pyds would periodically freeze up, 
sometimes spiking CPU usage.  When this happens I usually have to kill 
(-9) the server and restart it, and then it's okay.  It doesn't seem to 
be based on anything I'm doing, so I'm assuming it's the aggregator.

Anyway, just recently it stopped coming up successfully.  Well, it says 
it comes up, but it doesn't serve up any pages (it does accept 
connections, but they just stall).  It isn't taking up particularly 
large amounts of CPU or memory, so it doesn't seem like an infinite loop.

So I assume there's some bad persistent data in there.  Is there any 
good way to find out where, or to remove data?  I'd be okay with loosing 
my read history or other things, I just want to keep my aggregator 
subscriptions and weblog entries, and preferably my settings since I've 
mostly forgotten how I originally configured it.

Thanks for any help,
   Ian