tedster - 10:34 pm on Dec 17, 2010 (gmt 0) [edited by: tedster at 1:30 am (utc) on Dec 18, 2010]
There was a rash of this a couple months back - then gradually those pages returned. Sorry to hear that it's happening again. It sounds like some back end process at Google gets buggy, doesn't it.
You said these were high ranking pages - but of course the damage done also depends on the specific query term. Were they also high search traffic pages?
[edited by: tedster at 1:30 am (utc) on Dec 18, 2010]