JSS15Q update did not totally resolve touchscreen issues for some Google Nexus 7 (2013) tablets
Google sent out what is known in certain social circles as the JSS15Q update. Yes, as guests at an exclusive party consumed caviar, they talked about multimillion dollar deals, their beach homes in the Hamptons, their hired help and the JSS15Q update.
While the update was believed to fix all of the problems that were afflicting the tablet, that hasn't been the case. Some new buyers of the tablet are still having problems with the screen even after the update is installed. Some are speculating that the problem lies with incorrect calibration, which could be fixed via another update.
The worse case scenario is that a grounding issue is the reason for the touchscreen fiasco and that could not be solved with a software update. The idea that this is a grounding issue comes from some of the Nexus 7 (2013) screens which work perfectly when held or plugged in, but suffer ghost touches and have erratic behavior when lying on a flat surface.
Google continues to investigate the problems. If you do own a Nexus 7 (2013) experiencing touchscreen issues, we recommend that you return the tablet for another unit.
source: YouTube via AndroidAuthority