I've recently acquired a Class 4 8GB Kingston Micro SD card, and whenever I put it in the Dingoo with the adapter (the adapter's brand is SanDisk, but I don't think that's the problem...), the Dingoo freezes. I've tried formatting it with different cluster sizes and with different programs but nothing seems to work. I have a Mini SD card that the Dingoo will see, but not recognize. It doesn't freeze with that in, though. I don't use the Dingoo to format the card, by the way. The Micro SD card came with a SD adapter.
I have opened the Dingoo up, and the reader seems to be intact.