DB polling problem

Hi all,
I am using polling operation to poll Oracle database table. I am using update field i.e. logical delete opeartion under polling.
I have deployed my process, its running perfectly fine. Polling is also happening i.e. update and instance creation.
But the problem is that polling is not consistent. With the same set of values, sometime polling takes place and some time nothing happens, means no update in the table column field & no instanses on ESB Console.
I have checked the log file too, but no clues.
To overcome this problem, Whenever I restart my SOA server(10.1.3.3) everything works fine. But after few hours same thing happens.
Can anybody tell me, how to figure out what is happening.
Thanks in Advance,
Abhishek...

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