Hello,
What could be wrong if my writer stops playing movies in Ubuntu OS.
We're going to need a bit more information to help you out.
Are you trying to play DVDs? Blu-rays? VCDs? other?
Do you mean that it played movies at one point in time but no longer even attempts to play them, or it will begin playing movies currently but stops part-way through?
What version of Ubuntu?
What are you using as playback software?
What burner do you have?