The Shuffle is the process when defending players and their crews at Domination Sites are changed. The player who owns the site will not lose it - this change will occur in such a way that you will be surrounded by players which powers are approximately equal to yours.Thus, there will not be situations where one high-level powerful player holds the building forever.
The Reshuffling takes place every 12 hours (at 9 AM and 9 PM UTC).