I have something similar. When I leave to work, it works fine. On the way back, it won't turn on. The amber light flashes and nothing else happens. The first time I thought that I had missed that it was almost empty, but it happens every day. Then I assumed it was the battery, so I replaced that. Still same thing happens.
When I plugin the A/C, I can immediatly turn the device on and the reader reports (after booting) that the battery is almost full. After the booting I can unplug it from the A/C and it works again. It looks like sometimes the reader thinks it is out of power.
Yesterday I noted that when I plugin the A/C that when I wiggle the connector, the red light turns on and off. It looks like there is a loose contact somewhere for the connector and possibly the battery.
Of course it is out of warrant...
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