Problem with LG GSA-4082b

I have a LG GSA-4082B, firmware 201. Nero

I burned many DVD at 4x (DVD-R media - Verbatim) and 2,4x (DVD+RW media - Magnex).

I can read these DVDs with the DVD writer without errors, but if I try to read them with a DVD reader most files are ok but I always get a CRC error for some files. Why?

Can you help me?

Thank you.