If you open the windows task manager are the wow.exe still there or are the closed? Also, do you have any software monitoring programs that start? I dont know of anything that would kill the wow session but its worth a look to see if something you have installed closes programs that were programmaticly started.

Also, if you start the wow's manually does it close them? Keyclone has the ability to attach to the running wow sessions and even set the maximer for your windows layout.

Might be a work around till you get some answers.....