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External USB Keyboard/mouse randomly stops working on New MacBook Air Early 2020 model running Catalina 10.15.4

Subject says it all for the most part. I have an external USB hub connected to one on my Thunderbolt 3/USB-C ports on my MacBook Air early 2020 model running Catalina 10.15.4. At random times during the day (2-3 times a day) my Logitech G602 mouse and external Apple Keyboard will stop responding completely and only a reboot will restore functionality. The USB 2.0 HUB under System Information->Hardware->USB completely disappears until the MacBook is reported. Disconnecting/reconnecting the USB Hub does not resolve the issue. I have attached a screen capture of what the USB device looks like normally when things are working correctly. This MacBook Air has replaced a late 2019 MacBook Pro that was running Mojave and then Catalina 10.15.4 for the last 2 days of use. Using the same USB hub and external devices I did not experience this issue with that configuration. Granted I only was running Catalina for 2 days with the MacBook Pro 2019.


Things that I have tried to resolve the issue. Looking for additional suggestions to fix or troubleshoot the issue. I feel that my new MacBook Air is a big paperweight at this point.


  1. Reset NVRAM
  2. Reset SMC
  3. Startup in Safe Mode
  4. Ran Diagnostic check that came back clean.


Posted on May 11, 2020 10:38 AM

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Posted on Jun 18, 2020 4:48 AM

We're experiencing the same problem here! 🙋🏻‍♂️


Since my partner upgraded from a MacBook (12-inch, Early 2016, macOS Mojave) to a new MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports, macOS Catalina), the three USB-C peripherals (iPhone 11, Wacom Intuos Pro Medium, Seagate Fast SSD 1TB) plugged into the three downstream USB-C ports on the back of her 21.5-inch LG UltraFine 4K Display, keep disconnecting (all switching off at the same time) with the computer locking up and requiring restarting. 😫


When she takes the 21.5-inch LG UltraFine 4K Display (which obviously has a USB hub) out of the equation, and plugs her three USB-C peripherals directly into her 2020 MacBook Pro, everything works just fine.


So, what is it that's causing these disconnects? 🤔


  • LG's hardware, the 21.5-inch LG UltraFine 4K Display. Is it 100% compatible with Apple's 2020 MacBook Pros?
  • Apple's software, macOS Catalina, the way it handles USB hubs?
  • Something else?

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External USB Keyboard/mouse randomly stops working on New MacBook Air Early 2020 model running Catalina 10.15.4

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