Whenever I start Guitar Hero world tour or metallica, and start playing a song, the game lags. The highway with notes on it will jump forward a bit, making it impossible to hit some notes when they're coming up fast. I tried starting both games with discs, and then both games work fine. I'm using a Seagate FreeAgent Go 320GB ext. HDD to load from, I've had no issues before today with it. Running a Wii 3.3E, cIOS v10.