The latest complication occurred over the weekend when the six-wheel rover entered safe mode after experiencing a software file error.

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This segment also reduces adverse drug events and potential medication errors, and offers infusion system that helps protect all types of infusions with proprietary dose error reduction software.

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Saturday's failure was caused by a software malfunction, while the error earlier in the month, which caused the system to shut down for 20 minutes, was caused by incorrect input by an adjoining air traffic control center.

CNN: Software glitch delays London flights

"Saturday was caused by a software problem, not a human error problem, " Wright said.

CNN: Software glitch delays London flights

The problems can be caused by power failures, inadvertent severing of telecommunications links, corrupted software, bad hardware or human error.

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Investigators have attributed the failed 1999 Climate Orbiter mission to human error: The flight software used metric units while the ground system that wrote the code used Imperial measures.

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The worst part, Mr. Elkin says: realizing that, had he kept preparing his own tax returns, as he had in the past, the software probably would have caught the error.

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Even then, the error rate for facial-recognition software has proved to be as high as 10% in tests.

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Google also used the technology to cut the error rate on speech recognition in its latest Android mobile software.

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Some of the incomplete returns appeared to be human error, some of them were prepared by taxpayers using software packages and some of them were prepared at tax preparer offices.

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