Bluetooth doesn't show up after 10.13.4 install. Help please.

I've got the same problem with bluetooth on my MacBook Pro (Retina, 15-inch, Mid 2015). Its behaviour after wake is very erratic. In the least case, my mouse is not connected automatically so I reconnect it by pushing the mouse button. But also, in gradations of worse cases:

• I have to use the 'Connect' menu command
• I have to shut bluetooth off an on again
• Bluetooth is off when the computer wakes, and when switching it on again, it goes off and on again on its own
• Bluetooth menu hangs for a serious while when switching to 'on'
• Bluetooth stays off no matter how many times you try to switch it on
• Bluetooth has a zig-zag bar through its menu icon, and the Macbook says 'Bluetooth not available'.

In the last cases I have to restart the Mac in order to get Bluetooth back.

I already tried the various offered remedies of deleting preferences, resetting through the bluetooth debug menu, ...
But in short: bluetooth IS BROKEN in the 10.13.4 update.

NONE of this happened before the 10.13.4 update.

Hi,

Might be corrupted Bluetooth preferences. It can happen after a macOS update.

Open the Finder. From the Finder menu bar click Go > Go to Folder

Then copy / paste the following:

/Library/Preferences/com.apple.Bluetooth.plist

Then click Go then move com.apple.Bluetooth.plist file to the Trash.

Restart your Mac then see if the Bluetooth icon shows up in the status menu bar top right in your screen.