Finder and Safari seem to have this weird problem. A pop up will appear asking “Finder was unexpectedly quit. Do you want to reopen your windows?” This window will freeze (spinning wheel, not able to click, touch bar also doesn’t work) and reopen no matter what. This is the same for Safari, except Safari will stop when force quit. I have tried force quitting Finder, restarting, updating, killing the process in the Terminal, clearing the saved state in the Terminal, and force quitting in the Application Monitor. I am on High Sierra, and will get version number soon.
Edit: Recent hangs seems to be increasing by a rate of 1 a second. Edit: Safari works in restore mode (cmd+r)