I just upgraded to El Capitan. Am finding quirky behavior here and there. Under System Preferences > Energy Saver for both Battery and Power Adapter, I have Computer Sleeps set to Never and Display sleeps at 20 minutes. Put hard disks to sleep when possible is not checked. Under Security & Privacy > General I have Require password immediately after sleep or screen saver begins. So why is it that I get locked out of my computer after maybe 5 minutes? I was talking on the phone last night - on my Mac - and I was constantly logging back in during the call, and I know this was happening every 5 minutes max. What is wrong?