[SOGo] Constant login prompts after upgrade to 1.3.5a

[Donny Brooks]

We have began having an issue with our SOGo install since we upgraded to 
1.3.5a last week. If you sit idle for more than a few minutes, while 
composing a message or other, and try to select a message or other it 
gives the login screen instead. This has happened to all of our users 
since the upgrade. The "timeout" seems to be fairly random and I do not 
see anything particular in the logs. Is this a known issue?
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