After a week with sleep function turned off, it doesn’t start by itself at all. If I turn on the option, it restarts itself after a few hours.
Apple's support does not responding to this problem.
With my PowerBook Pro, the problem is even bigger because the sleep feature is more important than with the MacPro.
However, the PowerBook Pro doesn’t restart by itself all the time, but it’s so slow you can’t work with it. To use it, restarting is the only option, even if you don’t know if it will help or not. Sometimes after rebooting it works nice and smooth sometimes not.
Threfore I decided to install the original version (Sierra), but even that I can't do that because every time I run the installation I get a message that the file has an error. I really don’t know what to do throw it away or what?