Mysql Deleting??

Ok, this is the second time this week it has happened. When I try to axcess my blog. It says my wp-config. php is messed. I went into my cPanel. And it shows no mysql databases. I went to backup. They were right there. I downloaded them. Then I did a restore. They worked fine. A couple days later. It did the same. So, I am here. I have looked in my logs and havent seen anything suspicous. What do you think is causing this. Hack?, My server?, I have no idea. Any ideas thank full. (I am the only one who has access to the control panel