After yesterday's unwanted reboot (umptieth in a row over the past few weeks) I report new and worrying state, which denied control over two of the three open applications. I had to force shut down the computer.
As some fellow sufferers of the Sleep Wake Failure epidemic in High Sierra, I can only update on related events with my iMac, in the hope that this and possibly other threads will reach critical mass for apple to do something about it.
Also I did agree with comments suggesting possible ways of soliciting apple's action towards resolving this obviously significant problem, but my response was removed by apple. Hopefully, this one survives.
In the meantime, could someone, please help with an explanation why the 'AC power' list in the 'System Power Settings' of System Information shows the following entries:
System Sleep Timer (Minutes): 15
Disk Sleep Timer (Minutes): 0
Display Sleep Timer (Minutes): 5
presumably timers that can be set, while in the 'Energy Saver' section of System Preferences there are only two controls:
Computer sleep
Display sleep
which do not even match those above.
Thank you in advance for any response.