MySQL 4.1.13-debian + large HEAP table

I've been running mysql with the exact same
configuration for a while now, I have a heap table
150K rows which is a mirror of a disk table.

On a normal basis mysql used to consume about 300MB of
resident and 300MB virtual.   Things have been running
stable for a long time now and mysql's memory
consumption has been slowly increasing due to new data
being added to the heap table on a regular basis.

Now all of a sudden mysql surges in memory consumption
from the normal figures to more than double and triple
within minutes.  

Something I do must trigger a major leak somewhere, I
would appreciate anyone's help on how to debug this
issue and how to find where most of this memory is
being consumed.

Thanks a lot


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