Welcome to the Forum.
The problem you are describing in you initial posting is typical classic problem when poor quality problematic blank DVD Media is used to make a back up copy of the original Commercial DVD Movie Title and not a problem with the DVD Burner used to make the back up copy DVD. Suggest using known proven quality error free DVD media that consistently produces quality error free results such as Taiyo Yuden or Verbatim Media.
Unfortunately stating you are using â€œLG DVD-R disksâ€ doesnâ€™t provide information on exactly what DVD-R Media you are actually using. LG doesnâ€™t manufacture any DVD Media â€“ these LG DVD-R disks were actually manufactured by a DVD Media Manufacture that LG sub-contracted with to manufacture the DVD-R Media for them and LG just puts the LG Logo on the package of DVD Media.
The definitive manner to identify DVD Media is by using the Media MID (Manufacture ID and Media Code) (Example: TYG02) of the Media. To obtain the Media MID (Manufacture ID and Media Code) (Example: TYG02) use a utility software program similar DVDInfo (http://www.dvdinfopro.com/). For trouble shooting provide the Media MID (Manufacture ID and Media Code) (Example: TYG02) of the problematic â€œLG DVD-R disksâ€ you are using.