Memory and NUpdate

We have noticed on many of our servers (we have nearly 300 worldwide, running 7.0.2 FP2) that the nupdate task in Windows task is using up a large percentage of the systems memory (700-900mb). We have tried various notes.ini memory parameters without any affect. Increasing the overall physical memory on the boxes only seems to make Domino use more memory. My question is is there known memory leaks for this task that have been fixed in later releases, say 7.0.3 FP3?