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I think the kobo touch uses an infrared sensor to detect finger position.
If there's a section of the screen that isn't sensitive anymore, then maybe the sensors are blocked by dirt. Try using a microfiber cloth and clean the edges; move in one direction from corner to corner along each of the four edges and try to move all the dirt to a corner and out of the space between the screen and the raised edge.
After that, it may immediately start working, or you might have to reboot the kobo so that it recalibrates the sensor.
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