Let me piggy-back this thread.
I got my 2i today. I formatted my SD card w/ the Panasonic formatter. Have the latest AKAIO firmware and loader. I played a few games w/ no problem. Then I tried Pokemon Platinum (U), worked for a few mins then it froze. I resetted the DSi and got an "An error has occurred. Press and hold the Power Button to turn the system off..." when I load the 2i. I resetted it again, and the 2i loaded fine.
Later this evening, I played The Dark Spire (U). And it froze. When I resetted the game, I got the error message again. My 2i shows up on the DSi menu. But I can't load it. I tried reformatting my SD card and it still won't load.
Does anyone have any ideas? Much appreciated.