Apache proxy getting 502 errors talking to portal

We went live with our SAP project approximately 4 weeks ago. We use Apache 2.2 as a reverse proxy with mod_balancer splitting traffic between two SAP portal systems at version 7.0 ehp 1 service pack 7.
In the first 10 days we had two incidents where communication from the Apache reverse proxy to one SAP portal system was consistently failing with a 502 return code, but communication with the other portal system was fine. We do not see anything abnormal in the SAP logs.
The first incident was resolved by restarting just the Apache server while the second required restarting the SAP portal application on the affected system as well.
We are currently examining some leads found on the SAP forum and support site but are looking for input from others to help guide our investigation. The SAP Note 929082 describes a sporadic problem similar to ours except that ours was consistently failing for over 30 minutes.

Pinac,
Thank you for your reply.
We have a moderate level of logging turned on in the Apache server, so we can see that connections are being evenly distributed between the two portal nodes. To clarify the original statement, we consistently get the problem on connections that are using the portal node with which communications have gone bad, while connections to the other node continue to work properly.
We are reluctant to try the solution suggested in the note, because the KeepAlive value in the Apache proxy relates to communications between the proxy and the client browser, while the communication problem we are having is between the proxy and the portal nodes.
One option we are looking into involves disabling all connection caching between Apache and SAP by setting the DisableReuse flag. None of the examples we have seen have involved doing that but most examples appear to be using Apache 1.3 or 2.0 and so probably are not caching connections. Has anyone needed to do this with their Apache 2.2 reverse proxies?
The problem occurred again for us last Friday. We tested by connecting to the portal directly using a browser from the system on which the Apache proxy runs. Connections to the affected portal node on the SSL port were problematic, while connections to the non-SSL port worked. The same tests performed from a desktop on the portal's subnet yielded the same results.

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