Hello,
I'm running Roundcube version 1.5.2. Every 10 minutes or so, there's a message in a red error box that appears in the bottom right corner stating "Your session is invalid or expired". The message only appears briefly (for ~1 second), then the page auto-reloads. This is problematic because the selected email in the reading pane and the scroll position within that email are lost. Furthermore, if I'm in the process of writing a new email, I can't send it - clicking Send does nothing because the session isn't active anymore. I have to copy the text I was composing, go back to the Inbox view (then the page reloads), start composing a new email again, and paste the text into it.
Unlike others experiencing this issue, I am not logged out when this happens; the page simply reloads and I'm still logged in. Nonetheless, I don't think this is normal. I don't recall this behavior in previous versions.
Thanks!