How to fix Touch Key light not working: Turn on the Galaxy J7. Even though Android smartphones have come a long way, they can simply stop responding out of the blue. My current arsenal includes an Apple TV, Amazon Fire TV Stick, iPhone Xs, Samsung Galaxy S9, Samsung Chromebook, iMac, and Dell XPS 13. Some Galaxy J7 owners have reported that the Galaxy J7 system crash happens regardless of the app that they run. 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