When you say hanging, I would assume a blocked process. Run a query against sys.dm_exec_requests and look at the column blocking_session_id. This will tell you if one or more of your processes is stopping others from running. Then, you can look at that process and see if it's being blocked as well. If it's not, you look at the wait_type column to determine why it's running slow. The wait_type is not in clear english. You'll have to look it up online, but it will tell you why that process is running slow. You can then address it from there.
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