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USB Disconnects, Continued

The saga continues…

After adding ground connections to the lamp and keyboard / trackball tray (doodling off to the PC case), another disconnect after a day of rising expectations:

[37681.592585] hub 3-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
[37681.592595] usb 3-1: USB disconnect, address 4
[37681.592598] usb 3-1.1: USB disconnect, address 5
[37681.644329] usb 3-1.3: USB disconnect, address 6
[37681.720326] usb 3-1.4: USB disconnect, address 7
[37681.875555] usb 3-1: new full speed USB device using uhci_hcd and address 8
[37682.044444] usb 3-1: configuration #1 chosen from 1 choice
[37682.047403] hub 3-1:1.0: USB hub found
[37682.049363] hub 3-1:1.0: 4 ports detected
[37682.371776] usb 3-1.1: new low speed USB device using uhci_hcd and address 9
[37682.508656] usb 3-1.1: configuration #1 chosen from 1 choice
[37682.511687] input: Wacom Graphire3 6x8 as /devices/pci0000:00/0000:00:1d.2/usb3/3-1/3-1.1/3-1.1:1.0/input/input10
[37682.759115] usb 3-1.3: new low speed USB device using uhci_hcd and address 10
[37682.902996] usb 3-1.3: configuration #1 chosen from 1 choice
[37682.920106] input: Microsoft Comfort Curve Keyboard 2000 as /devices/pci0000:00/0000:00:1d.2/usb3/3-1/3-1.3/3-1.3:1.0/input/input11
[37682.957903] input,hidraw2: USB HID v1.11 Keyboard [Microsoft Comfort Curve Keyboard 2000] on usb-0000:00:1d.2-1.3
[37682.977914] input: Microsoft Comfort Curve Keyboard 2000 as /devices/pci0000:00/0000:00:1d.2/usb3/3-1/3-1.3/3-1.3:1.1/input/input12
[37683.033615] input,hidraw3: USB HID v1.11 Device [Microsoft Comfort Curve Keyboard 2000] on usb-0000:00:1d.2-1.3
[37683.238299] usb 3-1.4: new low speed USB device using uhci_hcd and address 11
[37683.377195] usb 3-1.4: configuration #1 chosen from 1 choice
[37683.398232] input: Kensington      Kensington Expert Mouse as /devices/pci0000:00/0000:00:1d.2/usb3/3-1/3-1.4/3-1.4:1.0/input/input13
[37683.436882] input,hidraw4: USB HID v1.10 Mouse [Kensington      Kensington Expert Mouse] on usb-0000:00:1d.2-1.4

I’m running out of ideas…