What - LACC North Sea had sickness problems, sector closures and traffic being shifted north into Scottish North Sea sectors? Yes, but as I say, not for a while, perhaps even a year in my own experience. While it wasn't what I'd call a common occurrence, it wasn't what you'd call "uncommon". I'm not sure if the problem was just "sickness", understaffing or a combination of the two, suffice to say it did happen.
I beleive ScACC may be undergoing the same problem at the moment, and still management want to remove more from the night shift!