Gsa-4082B got problems for read dvd after some minutes

I put some dvd and read it, but after some minutes, let’s say from 10 to 15 of continuous reading it stops. If I let it rest for a while and then put it to read the same file in the same spot where it have problems, it can handle it well for another 10 to 15 minutes and then stops, and so on. It does this with different brands of dvd, originals and backups, audio files, video files…
It has no problems to read cds, it can read’em for an hour or more without problems.
I want to know if there is a way to fix this or I just let it there to read and copy cds.
I’ve got another gsa-h42n wich can read the files perfectly fine.