Tamino Apache HTTP Server repeatedly consumes all the memory

Linux www-spkge 2.4.19-64GB-SMP #6 SMP
installed dual pentium 4 with 4GB RAM and 2GB Swap
Tamino XML Server 3.1.1.3
Tamino WebDAV Server 4.1.1.1

Problem: the Tamino Apache HTTP Server repeatedly consumes all the memory that is available. The system gets stuck and Tamino must be killed the hard way. Is that a known bug? The last time i had 12 /usr/local/apache/libexec/libhttpd.so (why no longer /usr/local/apache/bin/httpd?) processes each with about 410MB memory usage!
There is no heavy usage on the system up to now, but it crashes at least once a week that way!