When my laptop was under warranty my DVD Drive stopped reading or writing some particular DVDs. It only used to read DVDs from some comapnies and burn only DVDs from Sony. It did not burn DVDs from any other company which are cheaper that that of Sony. The Sony ones also worked with reduced perfaormance. I got it changed and the new drive worked properly for a month before the same problem came again and now my system is out of warranty. Help me please