He's had it about a year and a half. Suddenly it is freezing up during games-not any certain games, but several. Mostly when he's playing with or against someone else but also when he plays alone. We've tried the cart in my ds and so far it is not freezing up so I don't think it's the cart (R4) or MSD card. I let the battery completely discharge and then charged it (someone said to try this-they said you can get a bad charge?) and it is still freezing up. Has this happened to anyone? If it keeps up I will probably just get him a new one rather than spend the $$ to get this one fixed. He has dropped it in the past but for the past 2 or 3 mos he's had a nerf cover on it. Could that have caused it and had a delayed reaction? Is there anything else I can try? eta: I forgot to mention this-we tried a whole new R4 (I had a spare), the firmware is the most recent, and I tried formatting the sd card. I did not put new roms on it-I just copied his entire sd card into a folder on my pc and then copied it back onto the formatted card. My other two kids use the same roms and have had no problems. The R4 cards are not clones. The sd cards are kingston 2 gb.