I get that often when charging. I just click "okay" and double tap my screen to see charging % and then check again in 5 or 10 minutes to make sure it has changed. It has always gone on to charge to 100% in about an hour or so.
In fact, mine is charging now and I got the same message earlier at 12% (about 30 mins ago) and it is now at 74% but when I tap the screen, I get the message you do. I just click okay and ignore it.
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