DH is on his 4th Xbox - the first one overheated and I can't remember all the other issues with the others. I know his the games kept freezing and telling him he had a disk error. Do a google search, you will find info.....lots of people are having problems.
Microsoft has been replacing them with no problem. They send you a box, you send yours in and get a brandy-new one in a few days. I think they still have some major kinks to work out.