Game freezes - goes blurry, but no red lights

I had the same problem for about 3 weeks until one night I restarted it 3 or 4 times in succession after freezing and the RRoD (Red Ring of Death) appeared. 

If you try to send it back without the RRoD, it'll cost you about $99. You can always call up 8004myxbox and tell them that you've gotten the RRoD; they can't know for sure. They'll then send you a shipping label to send it out.