Sound is out of sync with picture on animated movie.

Purchased two Barbie animated movies for the family. Both movies start off playing just fine. About halfway through, the sound starts to lag versus the picture. This gets worse and worse until what you see and hear no longer makes sense. For example, a man character is heard speaking but the picture shows a woman character lips moving.

Near new computer and didn't have any trouble with downloading.

Have reported the problem but thought I'd ask for some advice on here.