DCOM applications hangs on win2003 sp1

My application runs on win2003 server with SP1. It runs as service
under local system account. Application serves several different
clients exposing DCOM interface. After some days application regulary
hangs, DCOM methods are not accessible for clients. After service
restart (net stop and then net start) application works fine until next
halt. Event log shows nothing special.
Where could i start my quest, i am suspecting new features in sp1 (Data
Execution Prevention(DEP) and DCOM changes). How could i detect DEP
intervention, are there any DEP logs?

Thank you for your replies,
Gregor

.

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