Comment 4 for bug 1159277

It has to do with how Samsung phones (at least of this generation) deal with being plugged in. They don't present a completely stable set of USB capabilities when initially connected, and while it eventually stablizes, the end result is that the mtp detector appears to see the phone appear twice - so the first time, it makes the connection and you see the window (which works fine), but the second time it 'appears', the connection attempt fails, unsurprisingly. Not sure what we can really do about it.