Hi and welcome to the forum
The most probable cause is indeed the disc. Memorex is not exactly the best media available in the market, and indeed some standalone players are rather picky with media.
Try again with a quality disc like Verbatim, this should solve.
If you still have problems, to improve compatibility with the standalone player change the booktype of the +R disc to ROM (most burners allow this). Alternatively, try to use a -R disc, again a Verbatim to be sure that you are using a quality disc