"NASA says its immobilized Mars rover Spirit has experienced another episode of computer flash memory failure such as it did four times earlier this year.

"During the events, Spirit fails to record data from the day's activities onto the type of computer memory -- non-volatile "flash" memory -- that can retain the data when the rover powers down for its energy-conserving periods of 'sleep,' " NASA said.

The reappearance of such anomalies might delay the start of the planned attempt to free the rover from a patch of soft soil where its wheels have been embedded since April."

http://www.upi.com/Science_News/2009/11/02/Spirit-has-another-episode-of-amnesia/UPI-29061257198863/