Monbase.exe has a memory leak

I have 110 IBM Netfinity servers (model 5100) that the monbase.exe process grows until the server runs out of resources. I can start and stop netfbase and that gives temporary relief. I have 2 servers that this is not happening on and I can find no difference between them. I have stopped netfbase, renamed monbase.exe and started netfbase, that fixes the problem but then I get no alerts of defunct drives or other hardware issues. NT4 server SP5 and Netfinity Client services 5.20.5, 5.20.6 and 5.20.7