Lg dvd ext burner n firewire



I have a vaio sony laptop and when I connect my lg 5163d burner with firewire at times is good and at times the burner disapear from the laptop restarting some time works but not allways, using usb connection is fine but sometimes i get and error burning dvd s, this error i don’t get it using firewire when it works.
I guess for some reason the firewire connection is not stable, one minute is connected and then is gone.with usb connection is allways there but as i said before I waste to many dvds. hope you can help Rocky