Have started having probs burning off movies/TV shows onto DVD-R's with Nero. They appear to burn ok but if there are say 10 episodes of a show and it's well within the 4.7gb of the disk when I come to play it back, the last file never plays and the disk just spins in the drive and then freezes up whatever I am trying to play it in. All the other episodes play as they should and there isn't anything wrong with the files.

Any suggestions as to what I can do or should I be using a different burning software for these files?

Audio files burn perfectly.

Do you get better or the same results in an actual dvd player instead of your computer? Have you tried other media/brands. Try +R see if that works.