[ 1679.120099] usb 3-1: new low-speed USB device number 29 using uhci_hcd
[ 1679.327721] input: Microsoft Microsoft Basic Optical Mouse as /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/input/input34
[ 1679.328845] generic-usb 0003:045E:0084.001C: input,hidraw0: USB HID v1.11 Mouse [Microsoft Microsoft Basic Optical Mouse ] on usb-0000:00:1d.1-1/input0
[ 1739.392149] usb 3-1: USB disconnect, device number 29
[ 1741.120083] usb 3-1: new low-speed USB device number 30 using uhci_hcd
[ 1741.326814] input: Microsoft Microsoft Basic Optical Mouse as /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/input/input35
[ 1741.327586] generic-usb 0003:045E:0084.001D: input,hidraw0: USB HID v1.11 Mouse [Microsoft Microsoft Basic Optical Mouse ] on usb-0000:00:1d.1-1/input0
[ 1801.392145] usb 3-1: USB disconnect, device number 30
[ 1803.120098] usb 3-1: new low-speed USB device number 31 using uhci_hcd
[ 1803.326926] input: Microsoft Microsoft Basic Optical Mouse as /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/input/input36
[ 1803.327696] generic-usb 0003:045E:0084.001E: input,hidraw0: USB HID v1.11 Mouse [Microsoft Microsoft Basic Optical Mouse ] on usb-0000:00:1d.1-1/input0
[ 1863.392140] usb 3-1: USB disconnect, device number 31
[ 1865.120093] usb 3-1: new low-speed USB device number 32 using uhci_hcd
[ 1865.327026] input: Microsoft Microsoft Basic Optical Mouse as /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/input/input37
[ 1865.327828] generic-usb 0003:045E:0084.001F: input,hidraw0: USB HID v1.11 Mouse [Microsoft Microsoft Basic Optical Mouse ] on usb-0000:00:1d.1-1/input0

why's that?