I have an answer here from 4.5 years ago that just got downvoted. Not a work of genius I admit, but workmanlike I'd say. I didn't directly answer the questioner but rather, in the spirit of the site as I understood it, gave some hints.
Reason I'm asking this question on meta is that I have had one or two experiences before of a reasonable answer being downvoted and then very shortly afterwards the whole q&a disappears. Which seems to be an abuse of downvoting an answer in order to be able to remove the q&a as a whole.