timeout expired

I get the following error because of a network issue we are having. We still havent figured out where the problem is. Here is the error:

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

I always get the error in the following stored procedure:

CREATE PROCEDURE spGetItemRackCounter
@fdRackType as int,
@fdItemOrderId as int,
@fdReturn1 int output
AS
Begin
      SELECT @fdReturn1 = Count(fdAssemblyBarcode)
      FROM tbStation5
      WHERE fdItemOrderId = @fdItemOrderId
      IF @fdReturn1 is null
      Select @fdReturn1 = 0
End
GO

I cant figure out why I get the error only when the program is accessing this stored proc but not the other stored procedures. I have about 20 stored procedures accessing tbStation5 table. And altogether about 60 stored procedures in this database. There are also 297772 records in tbStation5 table. What can I do to improve this stored procedure or table? If I add an index where should I add it to? Will that make things better?

Also the reason I say it is a network problem is because I get the error at certain times. Every day between 8:00 AM  9:00 AM and 12:00 PM 1:00 PM, and around 2:00 AM.
shamifAsked:
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chapmandewCommented:
You definetly want one on there if you're searching through a lot of records....it may not fix everything, but it is going to help.

create nonclustered index tbStation4_OrderID on tbStation5(fdItemOrderId)
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chapmandewCommented:
try this:

CREATE PROCEDURE spGetItemRackCounter
@fdRackType as int,
@fdItemOrderId as int,
@fdReturn1 int output
AS
Begin
      SELECT @fdReturn1 = Count(fdAssemblyBarcode)
      FROM tbStation5 with(nolock)
      WHERE fdItemOrderId = @fdItemOrderId
      IF @fdReturn1 is null
      Select @fdReturn1 = 0
End
GO
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shamifAuthor Commented:
I put with (nolock) but I am still getting timeout errors. I don't see how nolock can fix the problem.
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chapmandewCommented:
Do you have an index on the fdItemOrderId  field?
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shamifAuthor Commented:
no I don't
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shamifAuthor Commented:
Putting an index helped. The timeout error went to different stored procedure. I think we have to fix the root of the problem. But thank you for your help.
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