Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

Question

Hi Experts,
I have a windows service running every minute and has many database operations to perform.
It runs perfectly for many days, sometimes it suddenly stops and throws this exception. Later when we start to debug it, the exceptions goes off, but if we don't debug, the exception continues to come. We are tired of this totally random scenario. Please assist us with this.
We are using sqlhelper.cs for database interaction.
"Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding."
Best Regards,
Wajid Ahmed Ansari.