Ok, so the file(s) somehow became corrupted during the initial burning stage, or have been damaged, in some way since
I am a little surprised that they play ok in your Standalone Player, but maybe it has good error correction.
Out of interest, do the disks play ok with your PC Player software ?.
There isn't much you can do about the disks. If they are corrupt, that's it.
It could just have been a bad batch of disks , unless you have had the same problem with different brands, of course.