Nutch freezing on fetch

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Hi All,

We're experiencing problems with nutch freezing sporadically when 
fetching.  Not really to sure where to even start investigating.  Some 
digging into the archives suggested memory issues, so we did the following:

TOMCAT_OPTS=" -Xmx1024M" to increase Tomcat memory and 
NUTCH_HEAPSIZE=1500 to increase Nutch memory.

No effect - it's still freezing. Running on a current version of 
mandrake linux on it's own box, 2 gigs of ram, 2.4ghz P4. I believe 
we're running version .7 of nutch Does anyone have any suggestions as to 
where I should start investigating?

Thanks.