USB Device Constantly Disconnecting!?

After I leave my MacBook pro open overnight, I always receive "USB Device Constantly Disconnecting" notification from BBT in the morning.

Any idea how to solve this?

Mac model: Macbook Pro 2018 touchbar
BBT version 3.02 (1159)



maybe you are turning off the external monitor that powers some of the connected devices or something like this? (this can happen if usb devices do not get enough power)

Thanks for the reply. Yes, that could be the reason. I connect my Mac with Dell U2415. My monitor also connects with my iPhone and webcam. Both Dell monitor and Macbook has energy saving features.

Any suggestion to solve this problem? Thanks.

Mhm it might be the iPhone or webcam then. You probably shouldn't leave them plugged in or use some powered usb hub otherwise they seem to constantly disconnect & reconnect which can cause all kind of issues on macOS.

If you want to ignore this, you can use this terminal command to disable the warning message:

defaults write com.hegenberg.BetterTouchTool BTTDontShowConnectWarning YES
(requires the latest BTT alpha)

Yeah, same problem for me, very annoying! Older version of BTT never had this problem.

It's not a problem of BTT, it's just a notice that something is wrong with your USB devices. (which can cause all kind of issues with BTT) If you don't want to be notified about that, run this command while BTT is quit.

defaults write com.hegenberg.BetterTouchTool BTTDontShowConnectWarning YES

@Andreas, is there a way to find out which USB device is disconnecting?


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Thank you for providing a way to turn off these messages. I suggest adding this to the preference UI.

I have exactly the same problem. It just started three months ago. Whenever I plug my iPhone or iPod into a USB port to charge it it constantly disconnects and reconnects every second or two. When I quit BTT and it works normally. Note that I haven't upgraded BTT since version 2.570 so the problem began well after that.

I have:

  • 2015 iMac
  • Tripp-Lite USB hub model U360-007.
  • BTT version 2.570

This problem occurs with both the USB ports on the back and the hub (including the power-only charging port). I've checked the power supply to the hub (needed for faster charging) and it's OK.

I need to upgrade to the latest BTT but money is tight as I just purchased a tricked-out 2019 iMac. Soon.

This means your iphone is constantly disconnecting which will have a performance and power impact on your machine because macOS constantly needs to handle these disconnects. So possibly try with another hub. BTT only shows this message if it has received many disconnect / reconnects in a short timeframe.

You can disable the message BTT shows (either by disabling BTT notifcations in system preferences or using this terminal command:
defaults write com.hegenberg.BetterTouchTool BTTDontShowConnectWarning YES

However it will not prevent this bad behavior and may cause issues.

Hey @Andreas_Hegenberg, will it be possible to find a log of which device is doing this, or show a device name or ID in the notification? I've been seeing this notification when waking up laptop up from sleep without anything connected to it, in addition to times when I have real devices connected, both directly and through a USB hub. Would be useful in problem-solving or at least isolating the underlying issue.

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