I have a pool spa combo, that had two cracks in it, I had the pool refinished with Pebble sheen and I had the cracks repaired carbon fiber stitches, v-cut, epoxy, and hydraulic cement. Now 5 months later I see a crack forming again where one of the old cracks were very unfortunate and I'm very disappointed, I put a lot of money into this and apparently I need to take a new approach. Any advice on what I should do now?