I went from 1.8 to 1.9 and the wireless connection would just die after 10-15min. The usually-flashing LEDs would stay at a constant and the router would require a reboot to get it going again...then lock up after 10-15min. I disabled Super Turbo Fantastic G-whatever, Gamefuel is still on, using WPA, g-only.
Finally I reflashed back to 1.6 (for XBox Live reasons) and it seems to be stable again.
Anybody having similar issues?