Seam strength problem

Hello, I see no one who has had this concern so I'm starting. 1 month of use and strap runs out at the seam with the padded portion covering the shoulder. Yet I put in my diary, an EOS 550D, with a 18/270 tamron a 270EX flash and some spare batteries. On the practical side, do not worry, I press correspondent and I constantly on me. But strength side seams, I put a caveat. Sewing default and I caught him at the last moment before it falls to earth. So pass the dressmaker who told me he had all redo: cordura frays and ...... big risk of rupture ties with straps.
Sorry I made a comment if uninviting but it seemed necessary.