My BB was working this morning, but now seems to have failed. I've tried both payload positions, and arming mode. Nothing is working, and in arming mode the usb storage is not seen. When connecting to the usb port of a device (in any switch position) the LED shows green for about 2 seconds, and then nothing. It is very warm here today, so I thought it may have overheated. I've let the thing cool down for some period, but it is still not working. Any ideas? Are the devices known to fail?