Let me say by way of self-introduction that I worked in IT for more than 25 years, the last 14 at Sun Microsystems, where one of my specialties was troubleshooting. I draw on that experience to say this. I am seeing all sorts of proposed explanations for why High Sierra 10.13.1 wedges (that's the term we always used for a freeze in the OS requiring a forced reboot). People mention Apple mail, iCloud, etc. and other things that I never use along with Safari, which I rarely use, and thus these cannot be causing the problem I see because they are not running on my MacBook Pro when wedging occurs. One of my basic principles of troubleshooting when a new bug appears is to ask: what changed when these symptoms appeared? The obvious answer is Apple's release of High Sierra and perhaps the latest version. That is the place to look. Of course, it's possible that there are somewhat random interactions of the OS and apps, but since so many of us see this behavior, it seems to me much more likely that the root of the problem is in High Sierra. I'm running essentially the same apps that I ran before the update. The big change is High Sierra. It is also important not to mix together different bugs. I just read a post about the OS freezing for 15 seconds to a minute. That is not what I am seeing or what I read others reporting. My OS freezes indefinitely, and I have no option other than a forced reboot. I also see short app freezes which may or may not be related. I have seen posts by many others reporting this behavior, and the question that started this thread is "High Sierra MacOS freezing and stops." People reporting other sorts of problems, which I see a lot of in this thread, should start new threads and not clutter this thread with those reports. This is not a catchall for problems. This is a very specific problem, and when troubleshooting, you have to be as specific as possible. I'm sure there are other bugs in the software we run and in High Sierra, but they have to be fixed one at a time and each should have its own thread.