There are some glitches in the OAS 220.127.116.11. It at times would drop the connections and then you have to restart it. And one of the other problems I'm having now is that the OAS listeners wouldn't start after I did an upgrade on oracle. It might be the case on mine, b'cos I have both oas and oracle living on the same machine. It might not be a problem on your case. These were some of the problems I had and having with OAS. Try it on the test site and put it through a vigorus test before you open it for the production.
Did you get to try the iAS, which is the upgrade of OAS, and that seems to be stable at this point.