purely random as far as i've seen... some sort of hiccup they need to fix...
the hours aren't even accurate as you have seen. i've had it happen once.. i can't recall how long it was though.. maybe 2-3 days? Think others have had longe and shorter, so it vaies and nothign to do with time in the message given, of course... woudn't expect anything less here, BWAHAH.