@cekk In a similar situation, we used collective.beaker but we had a standard session manager object. This caused the same problem: A call to a DTML page (used to signal "UP" to our varnish load balancer) resulted in a Zope session cookie, and a Transient object. This brought our site down after 3000 seconds (the varnish health check interval being one second).
A similar site with collective.beaker which had the proper "beaker session manager" object did not have this problem. The solution to replace the session manager object with a beaker session manager resolved the problem for us.
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