The very same thing just happened to me 2 day lol.... I had just closed wi-fi after visiting FB and bang screen started going black then white with "rotating arrows graphic popping up.... it took me 3 soft resets to get back to normal and much longer for my heart rate to get back to normal lol.. so the thing is..... if you hit a problem and one reset doesn't work then try a second or even a third and a power recycle if you can BEFORE taking more drastic action like a hard reset
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