DVD query

A Flickhead reader asks: I wonder if you can answer a technical query I have about DVDs. In Paris I bought a box set of Jacques Tourneur horror films including I Walked With a Zombie. While watching it this evening, the image began to stop towards the end of the film, then jump, then proceed, then stop again. Finally, I gave up trying to watch it, although successive attempts did find it proceeding as normal in places where it halted before. Do you, or perhaps another Flickhead writer, know what might cause this? I tried wiping the disc with a clean cloth but to little avail.

I know it’s a film about consciousness stopped dead in its tracks, but the irony wore thin this evening!

Any suggestions in the comment box would be appreciated!