I was playing Jedi Knight up to some time ago, now Eternal Darkness on the emulator (both with a cheap BT controller)

You probably checked, but the stopper or the countdown timer could be running?
Or maybe it’s another app that has alarms set with a similar icon. You can check the running apps in settings -> developer settings -> running services

Even better! According to no hiding theorem, you can’t destroy information. With black holes you maybe possibly could be able to recover the data as it leaks through the Hawking radiation.
Perfect for long term storage