Asus 1608p2s problem reading burnt DVD

Hi to all, this is my first thread in the cdfreaks forum…
(I post this same thread in the ASUS/PIONEER section, I was not sure about the right location)
I own asus 1608p2s burner and I’m using Nero software.
I have a problem, two days ago when I burn DVD video (DVD-R), my recorder has problem reading it (accessing disc…) but my standalone DVD player reads the DVD without any problem.
Have you ever experienced this? Why is this happening?
I updated the drive with the latest firmware 1.41 but the problem still exists…

thanks a lot