Probs with Burnt DVD stopping



Hi I am seriously new to this so please be gentle. I have a new Hewlett Packard T860A computer with standard DVD Burner. I am using DVD shrink 3.1 and region free I am burning onto Sony 4.7 GB 8* DVD -R discs everything fine there. But when I play the copied DVD on my Sharp combo player some movies play entire way without a hiccup others stop and start and pieces fragment on screen or it will just freeze, but those DVDs play fine on computer. It says in book to copy in VR mode??? What is this and how do I get it and will it solve the problems. I clean all DVDs before I burn them and burner is clean. Please help