Mark, as someone professionally employed in making sure computer-controlled cars don't do wierd shit without warning, I'd say that's not too often, especially these days. More often it's down to hardware problems (eg. some random connector has dropped off) which would bugger anything, or more often still it's down to good old User Error. Certainly the increasing complexity gives more *potential* for things to go wrong though - and more potential for someone to fail to understand how it works. And sadly, since we're all human, also more potential for someone who makes a mistake to scapegoat the software instead of owning up and saying "oops, sorry".

Graham.