USB log event

Hi all.

The log is continuously generated as shown below.
What's the problem?

Feb 8 13:18:22 SLIPIOEWEB kernel: hub 4-3:1.0: USB hub found
Feb 8 13:18:22 SLIPIOEWEB kernel: hub 4-3:1.0: 2 ports detected
Feb 8 13:19:12 SLIPIOEWEB kernel: usb 4-3: USB disconnect, device number 70
Feb 8 13:19:13 SLIPIOEWEB kernel: usb 4-3: new high speed USB device number 71 using xhci_hcd
Feb 8 13:19:13 SLIPIOEWEB kernel: usb 4-3: New USB device found, idVendor=0424, idProduct=2660
Feb 8 13:19:13 SLIPIOEWEB kernel: usb 4-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
Feb 8 13:19:13 SLIPIOEWEB kernel: usb 4-3: configuration #1 chosen from 1 choice
Feb 8 13:19:13 SLIPIOEWEB kernel: hub 4-3:1.0: USB hub found
Feb 8 13:19:13 SLIPIOEWEB kernel: hub 4-3:1.0: 2 ports detected
Feb 8 13:20:17 SLIPIOEWEB kernel: usb 4-3: USB disconnect, device number 71
Feb 8 13:20:18 SLIPIOEWEB kernel: usb 4-3: new high speed USB device number 72 using xhci_hcd
Feb 8 13:20:18 SLIPIOEWEB kernel: usb 4-3: New USB device found, idVendor=0424, idProduct=2660
Feb 8 13:20:18 SLIPIOEWEB kernel: usb 4-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
Feb 8 13:20:18 SLIPIOEWEB kernel: usb 4-3: configuration #1 chosen from 1 choice
Feb 8 13:20:18 SLIPIOEWEB kernel: hub 4-3:1.0: USB hub found
Feb 8 13:20:18 SLIPIOEWEB kernel: hub 4-3:1.0: 2 ports detected
Feb 8 13:21:08 SLIPIOEWEB kernel: usb 4-3: USB disconnect, device number 72
Feb 8 13:21:08 SLIPIOEWEB kernel: usb 4-3: new high speed USB device number 73 using xhci_hcd
Feb 8 13:21:09 SLIPIOEWEB kernel: usb 4-3: New USB device found, idVendor=0424, idProduct=2660
Feb 8 13:21:09 SLIPIOEWEB kernel: usb 4-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
Feb 8 13:21:09 SLIPIOEWEB kernel: usb 4-3: configuration #1 chosen from 1 choice
Feb 8 13:21:09 SLIPIOEWEB kernel: hub 4-3:1.0: USB hub found
Feb 8 13:21:09 SLIPIOEWEB kernel: hub 4-3:1.0: 2 ports detected
Feb 8 13:21:58 SLIPIOEWEB kernel: usb 4-3: USB disconnect, device number 73
Feb 8 13:21:59 SLIPIOEWEB kernel: usb 4-3: new high speed USB device number 74 using xhci_hcd
Feb 8 13:21:59 SLIPIOEWEB kernel: usb 4-3: New USB device found, idVendor=0424, idProduct=2660
Feb 8 13:21:59 SLIPIOEWEB kernel: usb 4-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
Feb 8 13:21:59 SLIPIOEWEB kernel: usb 4-3: configuration #1 chosen from 1 choice
Feb 8 13:21:59 SLIPIOEWEB kernel: hub 4-3:1.0: USB hub found
Feb 8 13:21:59 SLIPIOEWEB kernel: hub 4-3:1.0: 2 ports detected