I have also executed "lsusb -t" and it looks like it is displaying new device, then disappearing and appearing with new device again. See lsusb_t.txt attachment.
** Attachment added: "lsusb_t.txt" https://bugs.launchpad.net/ubuntu/+source/gnome-software/+bug/1589585/+attachment/4686324/+files/lsusb_t.txt -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-software in Ubuntu. https://bugs.launchpad.net/bugs/1589585 Title: Ubuntu Software tab Installed refreshing endlessly every 2 seconds To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fwupd/+bug/1589585/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs