Slow PDF turns are not normal but possibly you can send one of your documents to tech support.
Don't know about the spark issue. Do you plug it into the wall first and then the device or is it plugged into the device and then the wall. Reason I say this is sometimes some of my laptop adapters do that if they are plugged into the laptop and then the wall. Don't know why.
I would see if they are willing to ship you a new one. Seems like they have done that for others.
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