IPad no longer recognizing CF card through USB port

I'm a photographer, Using a USB cable to a CF card reader, I can import and view my images via the iPad. This not only is easily done, Lexar's president has a video on Youtube demonstrating this.
I've used this feature regularly for several events.
However just recently the iPad has simply stopped recognizing the USB reader and said that there isn't enough power to do this.
So from 7/4-2010 through Friday,7/23 I was able to import images via this daisylink chain. Then on Saturday 7/24 I was no longer able to do this.
The iPad does seem to be losing battery power more quickly than when I first got it, so my assumption is that it is a mechanical thing and the iPad battery is defective.
Any thoughts? Please remember, this function operated smoothly for a month, and is described regularly in another company's marketing materials, and no changes to the iPad have taken place.

Have you tried making sure the iPad is fully charged before doing this? I suppose so.

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IPad no longer recognizing CF card through USB port

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