Null statistics for tables but still got optimizer problem

Hi,
We got a batch application on 10.2.0.4 Oracle database that does a lot of deletes and inserts when run it. Nightly statistics gathering was not enough so I deleted and locked the statistics for all tables. Now it has null statistics so it supposes to use dynamic sampling instead of statistics. At beginning the query executions were ok, however after the application ran for a well, it still chosen a very bad query execution plan (with cost over ten times more that it was normal).
What is happening here? Null statistics is still not good enough for the highly volatile database? Is there anything else I can do?
Thanks in advance.

Provide information like the structure of your table (including indexes), your compartibilty and optimizer settings, your SQL Statement and sample explain plan of the SQL.

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