Thanks for your answer. We are required to run the cart in iframe from an existing site. Since parent site is in a different domain than cart site (embeded iframe), looks like the browser can't create the cart session cookie. That is why i was loosing my stuff.
I solved the issue by punching the user out to an invisible page in cart's domain which creates the session cookie and then re-direct the user to the client site embedding the cart iframe. The browser has the ability to read the cookie and work with the session then...
ugly solution, but it works
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