The last message before I opened my MacBook this morning was
5/19/19 22:43:36.000 kernel: AirPort_Brcm43xx::powerChange: System Sleep
I'm not sure I closed it at that time exactly last night but it was close.
I've just run an experiment now and it took about 15 seconds from my last activity before I close the lid until that message appears.
IF you have the Command Line Tools installed, the BSD command last will give you the date and time for shutdown and reboot. Use it as last -n where n is the number of lines to display . Also the man page is useful.
Sometimes things unexpectedly happen and won't occur again. The alert on your iPhone was probably related to iMessage communicating with Apple's servers after the restart in an odd way and not something to worry about if it happened right at that time.
A box appears asking if I want to open the applications that were open before the computer restarted ...
In my case, I had added a SSD to my machine, which I put in the old DVD SATA slot. This is my main system disk, with an HDD in the original hard drive slot for additional storage. It seems that macos can only resume from a harddrive in the original SATA slot. Swapping the two drives fixes the problem for me!
As I don't want to install any software nor want to use Terminal for such a trivial task (nor have found any setting allowing me to never have my Mac sleeping), I use this:
Apparently, opening a Youtube video and keeping the focus on its tab prevents Chrome from sleeping (as you fake watching a video) and allows ...
We've been experiencing this issue and we're running Cisco 3802 Flex Connect with a WLC 8500.
We are going to attempt DIA This weekend but from both Cisco and Apple they are saying there isn't much we can do. Cisco is saying they will have a patch for the Wireless Controller to introduce ARP security for this in about a month and Apple won't release to the ...
You cannot allow the Mac to sleep. That is the fix. If you do, just make it standard operating procedure to unplug and re-plug. Been using Mac Pro's for music production for many, many years. This is not a problem, it is just how they work. Same as you can't hibernate a Mac, and you can't wake one up from LAN.
What seems to work on various systems (sometimes)...
Seeing exactly the same issue here with meraiki APs.
There was a recent firmware update. OTOH apple has updates all the time. So we are not sure if it was the FW upgrade or not at this stage
We managed to mitigate the problem by enabling client isolation on the SSID.
From the command line you can confirm the state of your sleep situation using the -getsleep argument to systemsetup.
$ sudo systemsetup -getsleep
Sleep: Computer sleeps Never
Sleep: Display sleeps after 10 minutes
Sleep: Disk sleeps after 10 minutes
This setup was accomplished by setting the preferences under "Energy Saver" section of System ...
I had this problem and did everything everybody recommended, including a clean reinstall. I found a workaround- Empty the Caches daily or every other day. Turn on Enable the Develop Menu
Choose Safari > Preferences, and click Advanced.
At the bottom of the pane, select the “Show Develop menu in menu bar” checkbox.
I do not know why this works but it does ...
Seconding Jerry Mazza's answer above. The same thing was just happening to my Air. The screen just blacked out and would not return until I jiggled everything around for five minutes.
Turns out my ipad pro with magnetic cover was sitting right next to the upper-left section of the keyboard (until my jiggling separated them). I can do it reproducibly now ...