So, I got my 3DS a while back the day of the price drop. It's worked fine, and did everything it's supposed to perfectly. Then, last weekend, I was playing Project X Zone on Friday night, plugged it in because the battery was low, and left the game on and in sleep mode overnight. The next morning, I put it in my pocket, like usual, but I noticed a couple hours later, the system was off. It was fully charged that morning, and the battery is fine (I've drained the battery recently from a full charge just to see how long it lasts, and it lasted for a few hours before the lights started flashing and it died), and it only shuts itself off when closed. I've also noticed that the longer I keep the system open, the longer it takes for the system to shut itself off (leaving it open for over an hour in the morning gets it to last well into the night in sleep mode). I also noticed another issue with being able to play DS games on the 3DS, when I try to play DS games on the 3DS, the screen that appears when you hit the power button shows up. This happens with all my DS games and DSi Ware.
Has anyone experienced a similar problem with their 3DS???