WebFacing and dying IE sessions

Hi list!

It's WDSC 6 (with all current updates), WAS 6.0.2 (with all current updates) on Windows 2003 servers and i5/OS V5R4. Clients use Windows 2000 Pro and Windows XP with Internet Explorer 6 with varying patch levels.

Our problem:

Intermittent dying WebFacing sessions on the client side. It looks like this: people work in our applications as intended. They press enter or a function key and every now and then the current browser session just vanishes and they fall back to our portal site where they originally launched the WebFacing application.

Result: the session zombies on the iSeries

- issues are not reproducable
- there are no JS errors in IE
- there's no specific webfaced dialog where people just drop out - it's totally random
- sometimes people lose sessions 3-5 times a day, sometimes they work a week without fuss
- it's not an inactivity time-out issue because we cover that in a client script
- it's not a connectivity issue because people are able to continue working in a parallel opened session
- sometimes it takes 5 minutes until the drop out, sometimes they work literally hours continuosly

Questions:

1. Has anyone similar issues?
2. Even a simple webfaced page easly has 6.500 lines of code (with all JS includes). Is it possible that IE 6 might get overloaded over time? Like is getting issues with garbage collection, memory allocation or memroy leaks?
3. Has anyone an idea how to trace that issue?
4. Is anyone having suggestions to maybe make the resulting WebFace slimmer?

I'd apprechiate ANY help!

Kind regards

Heinz

Mit freundlichen Grüßen