suspicious activity on your account

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every time i search a few topics or post a couple of ansewrs or start a couple of discussions does mylot say "WE HAVE NOTICED SOME SUSPICIOUS ACTIVITY ON YOUR ACCOUNT" please try the search again later? sometimes i forget to change the search from discussion to web or vice versa but am i doing something that i shouldn't be? as far as i can tell im doing what i do everyday while looking after my kids, seaching the web and trying to find work