This is a weird touch screen issue as only part (2 blocks) of the screen is not working. I tested the touch functionality via "Touch Test" and observed that 2 red zones are not responding to finger tap (see screenshot). Where there are 2 thin gaps (actually 2 lines) are responsive. This happened after an app update (15 apps). I didn't drop the phone during this period. So I am suspecting this might due to a software issue. What could cause this issue?
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