same here, in August right after the system upgrade there was a black dead screen, I fixed it. since then it keeps rebooting and with the time it gets worse and worse. if a month ago it was restarting just 1-2 times at once, now it restarts 10 times at once. Also it keeps showing 20 times at once an error message like " instagram app has stopped". The screen is problematic as well. So I just think to replace it and never buy samsung again.
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