Spamassassin exceeded time limit, not stopping spam

[bsnottum at hkskole.no]

Hallo!

I am running mailscanner-4.44.6-2 on fc2 - yes I know it is old and I will
set up a new server shortly. Anyway I have a problem with spamassassin
that I really need to solve before I build the new server.

My problem is that spamassassin does not stop spam! In the mail-header it
says: not spam - exceeded time limit. If I restart mailscanner it works
for a while - a few minutes, but after this the error starts again.

Can anyone tell me what is going wrong here?

Regards

Bjorn