The issue is the stone used to mix the concrete was too dry so when the stone absorbed the moisture in the new cement they expand and pop up the cement. If you haven't made a warranty claim AND notified the warranty insurance company before the expiration of the one year warranty you're wasting your time. I lost my mediation case against TV over this issue because I had not notified the insurance company before the end of the one year but TV warranty was fully aware and failed to repair them properly.
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