I have this problem too but my experience does not fit their explanation. I used my card reader once a year for a three day craft show and used it successfully for three years in a row. Three days every year for three years with no problem. Went to plug it in for the fourth year and there's the error message. So it can work perfectly well with intermittent charging. I just use the PayPal Here App to take card payments manually which is a bit of a pain but there's no way I’m paying for another card reader. If I get another reader it won't be PayPal.
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