unable to enumerate USB device

Hello:
My CPU-GPU server amd64 wheezy, when connected or disconnected from
the router raise

hub 5-1:1.0: unable to enumerate USB device on port 3

Which occurs at no end. I tried (se superuser) "update-usbids", which
saved to /var/lib/usbutils/usb.ids.new , but the problem persisted.

Thanks for advice
francesco pietra

I begin to be submerged by too much automatisms, which is for me
difficult to suppress, like gnome (when I open X11 for graphics) tying
to do much that I don't need.