NASA engineers think they've got a way to communicate reliably with Spirit after it stopped responding normally last week. They believe the glitch - which caused the rover to reboot more than 100 times, transmit gibberish, and stay awake at night - was caused by a problem with its 256 MB flash memory (similar to what you might have in your digital camera). Until they can come up with a solution, they will wake the rover each morning in a way that stops it from using this troublesome component. For now, it's stable and open to new commands.