You have a USB device failing:
Jan 13 12:55:41 AIVAS kernel: usb 10-4: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd
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Jan 13 12:55:57 AIVAS php-fpm[7449]: [WARNING] [pool www] server reached max_children setting (50), consider raising it
Jan 13 12:56:12 AIVAS kernel: usb 10-4: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd
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Jan 13 13:14:25 AIVAS kernel: program smartctl is using a deprecated SCSI ioctl, please convert it to SG_IO
Jan 13 13:14:40 AIVAS kernel: usb 10-4: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd
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Jan 13 13:16:11 AIVAS kernel: program smartctl is using a deprecated SCSI ioctl, please convert it to SG_IO
Jan 13 13:16:27 AIVAS kernel: usb 10-4: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd
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Jan 13 13:43:05 AIVAS kernel: program smartctl is using a deprecated SCSI ioctl, please convert it to SG_IO
Jan 13 13:44:06 AIVAS kernel: usb 10-4: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd
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Jan 13 13:45:08 AIVAS kernel: program smartctl is using a deprecated SCSI ioctl, please convert it to SG_IO
Jan 13 13:46:09 AIVAS kernel: usb 10-4: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd