Then the mouse pointer began displaying that jerky-jerky, stutter motion again. ![]() What remained was the native Apple Mouse Drivers. Anyway, my experimentation entailed completely removing all things Kensington, then I re-booting. I wasn't sure if the problem started with the Mac OS upgrade to 10.15.3 or the Kensington upgrade to 2.1.11. I mistakenly upgraded my Kensington wired Expert Mouse to their latest software (upgraded from, I believe, TrackballWorks v1.5.0 to the 'new-and-improved' KensingtonWorks 2.1.11). My iMac (Retina 5K, 27-inch, late 2015), 3.2GHz Quad-Core Intel Core i5, 24 GB 1867 MHz DDR3 RAM with the OS: Catalina OS version 10.15.3. Ran Diagnostic check that came back clean.I feel that my new MacBook Air is a big paperweight at this point. Looking for additional suggestions to fix or troubleshoot the issue. Things that I have tried to resolve the issue. Granted I only was running Catalina for 2 days with the MacBook Pro 2019. Using the same USB hub and external devices I did not experience this issue with that configuration. 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. ![]() I have attached a screen capture of what the USB device looks like normally when things are working correctly. ![]() Disconnecting/reconnecting the USB Hub does not resolve the issue. The USB 2.0 HUB under System Information->Hardware->USB completely disappears until the MacBook is reported. 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. 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.
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