The ends of some lower quality DVD discs are sometimes problematic - I've resorted to burning about 3.7GB instead of the full 4.38GB on some cheap Leda DVD media because of this.
It could be that the NEC is reading the disc too fast - it reads at 8x CAV for recordable DVD media while the Pioneer I believe only reads at 2x CLV. I have managed to slow down the NEC to 2x CAV (!) with Nero CD speed by setting the read speed to 1x. See if errors persist with a lower read speed?