Mine was acting weird as well, and I was having some weird glitches. I couldn't connect to a room, it would say could not establish connection to server, and I hit refresh on the rooms, and only five came up to seperate times so I gave up and went to Special Events.
I was doing the rally special event and as your car edges up to the starting line it started veering to the left until it was aimed at the wall.
Then when the navigator counted me off his voice was garbled and instead of flashing 5-4-3-2-1 it flashed 3-2-1-go while he was still on three.
I was afraid my PS3 was starting to rebel at another 12 hour GT5 marathon, so I shut it down and gave it a rest.
I just hope my PS3 isn't dying, I've got a lot of saves and time that I'd lose :sad:
