MacBook Pro (15 inch, 2018) external monitor: LG HDR WFHD After upgrading to 11.1, my external monitor started going to a black screen for about 1 or 2 seconds ... and it occurs ~every 2 hours or so. Prior to the 11.1 upgrade, there were no issues whatsoever.

MacBook Pro (15-inch, 2018) macOS Big Sur 11.0.1 The 11.1 update gets to 10 minutes remaining and stays indefinitely. Well, at least the 1.5 hours that I was willing to wait. Tried multiple times with the same result. The following process is driving high CPU: /private/var/db/com.apple.xpc.roleaccountd.staging/com.apple.MobileSoftwareUpdate.UpdateBrainService.16777220.24853506.xpc/Contents/MacOS/com.apple.MobileSoftwareUpdate.UpdateBrainService