Freetext search taking more than 45 sec to Execute after every 15min

ALTER PROCEDURE [dbo].[sp_ftsearchOnResumetbl]
(
	@StructuredXMLResume_ExecutiveSummary							NVARCHAR(100),
	@StructuredXMLResume_Qualifications_QualificationSummary		NVARCHAR(100)
)
AS
BEGIN
DECLARE @searchWord NVARCHAR(200)
	SET @searchWord= @StructuredXMLResume_ExecutiveSummary 
               +' '+@StructuredXMLResume_Qualifications_QualificationSummary
	BEGIN TRY
		SELECT ResumeId,StructuredXMLResume_ExecutiveSummary as 
                Exesummary,StructuredXMLResume_Qualifications_QualificationSummary as Qualifications FROM Resume
		INNER JOIN FREETEXTTABLE(Resume, 
             StructuredXMLResume_ExecutiveSummary,StructuredXMLResume_Qualifications_QualificationSummary),@searchWord) 
              AS KEY_TBL
		ON ResumeId=KEY_TBL.[KEY]
	END TRY
	BEGIN CATCH
		RETURN 1
	END CATCH
END