Greetings Carl - There are several possibilities, one being that you are using incompatible discs (DVD+R instead if DVD-R as required). The other is that this player is well known for being finicky about even discs of the right type (see above), working well with some brands, so-so with other brands and not at all with still others.
The most likely thing I suspect is that after recording material you are not finalizing the discs. If they're not finalized they will only play on the Samsung and not other devices. This is demonstrated on page 84 of the user manual:
Regards,
Mikeywaf
Testimonial: "Thank you very much, I did not know about the finalising."
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