Macro slows down with each successive run

I have a macro created with the Record Macro function and linked to a button in an Excel 2007 worksheet. The first time the macro blazes through but with each additional run it slows down until after 5 or 6 times it barely functions. I tried clearing the clipboard between runs but it did not help. Is this a VBA issue? I have no VBA skills. I can post the worksheet if needed but was hoping it might be a simpler fix.