Forgetful are we?
As we all know, Spirit has been stuck in deep Martian sand for some time now. That hasn’t changed. What has changed is the rover’s memory. It’s going. NASA scientists are calling the issue “amnesia,” and it isn’t the first time this phenomenon has affected the rover.
Basically, what happens during an amnesia event is the rover fails to record any observations—scientific or otherwise—in its flash memory during power down time at night. Worse still, the cause is unknown. My uneducated guess is a Martian is playing with a magnet.