Hi, I just joined this forum, hoping to seek the answer to my problem. I ordered my R4 + 1GB Kingston microSD (advertised as Japanese version with the CO1G imprint on the microSD card) from dealextreme.com and received it a little over a week ago. The R4 froze on me several times (most of those times in Age of Empires 2, about 2 - 3 times in Advance Wars and 1 time in Starfox Command). 2 times, it went 'glitchy' and the screen was covered in purple/green lines and a weird buzzing sound was being heard. I'm wondering if my R4/microSD card is defective and if they are, which one? I used the ATTO program to test the microSD card speed and the readable speed was ~10 - 10.4 mb/s and the writable speed was ~4 mb/s.