Inexpensive Supa-Cheap Dvd-R discs are not likely to play well on many set top players. CMC products have frequent data integrity issues, BUT those that will copy back to your hard drive after playing will play just fine on set top players.
The latest crop from Ritek and Ricoh have the same results listed for CMC, and that is spot-quality issues. Optodisc are rumored to have spot quality issues, but I have not purchased any to review. Why do that when Daxon and Prodisc are similar prices?
Sony, TY, Daxon, MCC-Verbatim, and Prodisc that are rated 8x or greater will be most compatible with the speedy burner. I have noticed zero playback problems with these. MCC-Verbatim and Prodisc make the prettiest scans.
+R discs set to -ROM with the bitsetting utility seem to work best.
Your playback issue could be caused by writing software in use.
DVD-Decryptor has an awesome ISO write mode, and the bitsetting utility is built in.
It also takes just a single keystroke with DVD-Decryptor to quality control the disc after writing. The "F" key will put it into rip mode so you can copy the disc file-by-file back to the hard drive (select all files).
This will end in an "OK" dialog box. If, instead of clicking "OK", you scoot the "OK" box slightly to the right, then you can see the Read Retries listed on the main screen underneath. You should have zero read retries, and that means 100% data integrity, and 100% data integrity will give your set top player a chance to work properly.
If you got all of that, you could have a computer with extreme heat in the case near the DVD writer drive, causing expansion of the plastic during writing. I've only seen this in person one time, but it is not impossible.