Firstly,
What is the specification of the server/disk setup do you have? Also has any thing changed (increased volume, server h/w etc). Is the SQL server sharing resources?
To start with I would check the current wait stats see Pauls [blog][1]. From this you maybe able to determine what is causing the 'hanging'.
Post back the waits or Pauls blog describes some of the more common ones.
[1]: http://www.sqlskills.com/blogs/paul/wait-statistics-or-please-tell-me-where-it-hurts/
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