PS3 Message Box Problem

So basically, my problem is that when I open my inbox and look at a message, my controller freezes up or something. I cant press anything or move. Ive tried it with both my Mayflash stick and my Dualshock 3. I’ve turned it off with the switch at the back and waited a while then tried again, same problem. But I can send messages normally (without replying). Has this happened to anyone else/does anyone know how to fix it?

I’ve had this problem before. I dunno what caused it but I ended up formatting (although it wasn’t my reason for formatting) and that fixed it.