About a month ago i went to start my car after i had been driving for a while and it would not start, i turned the key and nothing, no spark, it was completely dead. i let it sit for about 20 minutes and started right up. I've been driving it ever since and have not had this problem again until the other day when i went to start it and the same thing happened. I let it sit for 20 minutes and again it started back up. Don't think it's the battery because while car is dead lights and radio still work.