For #1...
I've had a problem where my memory card isn't read, and 'believe' it to be due to temperature and low levels on the battery. If my battery level is below 3 bars and the device is cold, I think the device is unable to adequately power the card reader. Everything else works, and once I've held/fiddled with the device long enough to warm it up, things work again (or I remember to keep it cahrged above 3 bars).
This is based only on my own experience...avoiding the above situations has left me without card-reader problems...so far. I'm hoping that's all it is.
Good luck!
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