Machine: MacBook Pro (Retina, 15-inch, Late 2013), 2.3 GHz Intel Core i7, 16 GB 1600 MHz DDR3 After the frustration of dealing with several issues I have gone back to 10.12.6 Just a few things that 10.13.3 broke; Slow as molasses boot-up. Boot was ~ 15 seconds, with 10.13 increased to 45 sec. Constant random reboots, some times after 10 minutes or 2 or more hours. Logs indicated kernel panic. Macs fan control removed (not supported). Safari page loads slow as molasses. Grrr. Face Time calling via iPhone not working. The sound for notifications not working. Keychain access removed from menu bar. Screen flicker or jitter on streaming movies. Used an additional 30GB of drive space. Blue tooth issues. Hot Spot connection Issues. I changed from Windoze to a Mac in 2013 and 10.13 has been the worst update I've ever experienced! Really Apple? Your QA person should be canned. I use my Mac to make a little money on the side trading and having an unreliable machine is not tolerable.