Assuming the restriction is because of the fair-play policy, your account will be fully re-enabled when you play more games that decrease the overall % of games where you disconnect or abandon.
http://support.chess.com/Knowledgebase/Article/View/171/0/fair-play-policy
Hi,
It says I can't play live chess because my account has been restricted - although I never intentionally did anything wrong.
How and how soon can I change that?