memory leak in TS 5.5.2 on Solaris?

System

We converted from TS 4.5.1 SP2 to 5.5.2 SP1 some days ago. After one day of work, we were no longer able to start any workflow. The only way out was to stop TS server and start it again. Some hours later we had that same behaviour again. We then noticed that the iwserver process was 1.8 GB big. After stopping and restarting it took only 150 MB.
We then wrote a litte perl script to watch memory consumption and let it log some information to a log file. It is obvious that after aome minutes with high throughput the server process takes some kb more of memory and nver frees it again.
The only workaround is to stop and restart TS server daily - pretty annoying!

Anyone else ran into this problem?

Olaf Berndt