Why do some films stop playing on my DVD player?

Answers: are they burned movies? they could be bad burns.
If they're store bought next they may have a cut into
Or your lens is broken/starting to go
It may also be a really cheap DVD player... within that case upgrade to something that didn't cost $20. (the $50 work freshly fine for regular dvd playing)

That usually indicates scratches on the DVD.

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