Trouble In Paradise Meaning

(idiomatic) An unexpected problem in a supposedly positive situation, especially in a marital or romantic relationship.

Example:   My wife wasn't in the best of moods on our honeymoon last week. ― Trouble in paradise?
1969 Feb. 14, "New Plays: Pilgrims' Regress," Time (retrieved 10 July 2014):
  Chaucer's people are not paralyzed by self-consciousness in the act of love. They possess none of modern man's neurasthenic haste to import trouble in paradise.
1996 Dec. 10, Clifton Brown, "Challenge for the Bulls Is to Repair the Cracks," New York Times (retrieved 10 July 2014):
  Is there trouble in paradise? Maybe not, but it will be interesting to see whether the Bulls can make it through another season without serious internal problems.
2013 Oct. 5, Tom Russo, "Reasons to get ‘Stuck in Love’," Boston Globe (retrieved 10 July 2014):
  [H]e’ll keep on peeping through her window, anxious for some glimpse of trouble in paradise with the new boyfriend.