Twice now in the last 24 hours, my N97-1 running the V11 firmware has auto-locked and subsequently pressing the keyguard aka lock switch on the right side and trying some N97 unlock voodoo from the last time this happened didn't work. I'm am going to do a hard reset and not re-install Nokia Sports Tracker and ShoZu (both of which are unofficial 5800 versions) and if it comes back, I can then definitely blame the hardware and firmware. Stay tuned!