Why windows service get hang after long run

[abcd20]

I have written a windows service which run continuously on a server. Interval time is 9 sec. On timer1_interval i am fecthing record from database and sending it to user. And changing its record status.

this service stop fetching records after running 4 to 5 days. We need to restart the service. there is no GUI involve in this code

[PsychoCoder]

I would first start with checking the event log on the server it;s running on to see if any error is being logged