S4S will always try to keep the session alive without explicit intervention however this anomaly can arise due to the Sitecore layout pipeline. It typically coincides with post backs to the server to change the page contents, like transitioning from the view to edit mode or paginating. The page loads, but the session state is lost.
To resolve, please ensure the web control you are using is listed in the "typesthatshouldnotbeexpanded" section of Web.Config.
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