Hi Severin, Some programmes perform periodic activity which (intentionally or not) will restart your Mac's time-to-sleep timer. For example, downloading a large file will prevent your disk from going to sleep and thus prevent your computer from going to sleep. Continuous file sharing and internet chat logging can have this effect also, despite the fact that you have walked away from your computer. Severin, if you close all your apps and leave the computer for 10 mins, does it go to sleep? I imagine it won't, but if it DOES, then you should try to identify which programme is the culprit.
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