When my DSI camera was doing this to me I got a sewing needle and carefully scratch cleaned the usb pins in the socket and tried to lift them a little to improve the connection. I don't know if that fixed my problem or not, but it hasn't happened again.
I'd hate to have to try that on one of those miniature usb sockets on a cannon camera. I guess I'd be using a can of contact cleaner there instead.
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