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SD card intermitted connection. detect and undetect

in flag

Ubuntu 21.04 and old iMac 2013. Using an USB to SD card device Kingston MobileLite G3, I can't seems to get it to connect properly. It takes about 3 to 5 seconds to detect it, and half a second later it disconnects it. It keeps doing this all the time in circle.

If I insert the sd card in the iMac slot, then it may take about 1 minute to detect it. Might stay on for a few seconds and disconnect. The SD card is a 16 gig card.

If I boot in Windows, there is no problem at all. So it sounds like the card is not defective and the hardware is also OK.

Is there any driver I should install? How can I find out what needs to be done?

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