I bought a new 2018 MacBook Pro with Touch Bar. I am experiencing Bluetooth issues such as my Magic Mouse disconnecting randomly and lagging. These are the steps I have taken (not in the order as listed here) though I am still experiencing the dropouts. Any other suggestions?
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Removed Bluetooth devices from existing connections.
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Clean connectors from mouse.
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Remove and reconnect Bluetooth devices.
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A combination of disconnecting, resetting NVRAM, safe mode, and pairing.
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Unplugged USB-C hub to avoid interference.
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Renamed my Bluetooth devices.
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Removed com.apple.Bluetooth.plist (whenever the Bluetooth is about to cut out a copy of
com.apple.Bluetooth.plistis created, not sure if this means something).
[Edit: I have had my Bluetooth antenna in my MacBook replaced and it is somewhat better, though, still not fully solved]
Best Answer
Updating Xcode has limited the disconnects from the keyboard and Magic Mouse (still not perfect but much better).
To update Xcode, open your Terminal and enter
xcode-select --install. You may have to delete the old version of Xcode before installing the latest Xcode. Make sure to also install the command line developer tools.