Intermittent Card Reader Problem

jim evans wrote:
About one time in 5 when I insert a camera card into my card reader
the computer does not recognize/see it. When this happens I have to
disconnect the USB cable and reconnect it (sometimes twice). The
connector had not been touched or moved in any way before this
happens. This condition has persisted through two computers, two card
readers and two cameras.

What causes this and how can I correct it?

jim

One explanation I read recently on a NG is that when there are too many USB devices
drawing power, the USB controller will shut some off.

When that happens to me, I try to unplug the device, wait a few seconds, and plug it in
again. That sometimes works. Sometimes I have to reboot.