Microsoft Access 2007 Lags after Print Job

I am new to Microsoft Access.

I added some queries to an old and existing database (.accdb) using Microsoft Access 2007.

I created two forms in Access, and two buttons in the Switchboa开发者_如何学Gord.

Whenever the buttons are clicked, I load the form which was created using the SQL query through the Form Wizard.

However, now whenever I print, the particular form which has the print button using the following old existing code.

 Private Sub CmdPrintInv_Click()
On Error GoTo Err_CmdPrintInv_Click

    Dim stDocName As String
    Dim sqlstr As String

    sqlstr = "InvType='" & InvType.Value & "' AND InvNo='" & InvNo & "'"

    stDocName = "R-Invoice"
    DoCmd.OpenReport stDocName, acNormal, , sqlstr

Exit_CmdPrintInv_Click:
    Exit Sub

Err_CmdPrintInv_Click:
    MsgBox Err.Description
    Resume Exit_CmdPrintInv_Click

End Sub

Previously, the database was working fine after clicking print. The other buttons were responsive.

Now, the database lags, particularly the window attached. Whenever I try to click other buttons, they are not responsive.

Any advise would help me out.