That's typically a cracked substrate, but if they replaced the last one you either got lucky or something else happened. Hard to tell from your current picture whether it's cracked or not (typically curved or angled lines). That typically could happen from twisting of the device or a point pressure on the screen breaking the substrate. Do you carry the device around in a bag or purse? Having it in a case (unless it really hard and doesn't flex) won't necessarily protect it from twisting.
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