Sounds like exactly what mine does. I get the DNS msg too, I just didn't know that's what it was called. How is your PS3 still connected to the internet if it says connection interupted?? If it signs you out of PSN, and gives you a DNS msg. it means you are no longer connected to the internet. It most likely IS something to do with your internet connection or modem by the sounds of it. If it gets worse I'd check that first. I can play for hours "normally" then all the sudden I just lose connection, get a DNS msg. and have to reset my modem, then I can reconnect and play for hours once again.