I believe if you time out you get the warning because they don't want people running the clock down on purpose in a losing position. If it doesn't happen often and it's not deliberate I don't think you need to be concerned.
what does restiriced mean?
you likely have to wait 5 min between games.
http://support.chess.com/Knowledgebase/Article/View/171/0/fair-play-policy
If you need help, please contact our Help and Support team.
Some one wrote to me that i may have violated "Fair Play Practices," because my "account" is restricted? How do i change this?