Hello everyone. Longtime lurker, first time posting. Before going into my issue, let me get out in front of a few of the typical questions. No, I do not have an R4 clone. I have had the official R4 for around 18 months. Yes, I have formatted the microSD (a 1.0 gb SanDisk) and installed the official 1.18 kernel from r4ds.cn. I even removed all of my themes, and am now just using the default theme. Around 2 weeks ago, I loaded NDS 2596 onto the microSD, after not touching the DS for about a month (new baby came!). I was really excited for this game. I spun up the R4, and started the game. Played for 15-20 minutes, made sure it saved, then turned it off. When I came back a couple of hours later, the R4 said there wasn't a .sav and wanted to create it again. Knowing that I lost my work from the first 20 minutes, I rolled my eyes and tried again. This time, though, I didn't play the game. Started it up, then just turned it off. Immediately, I turned it back on, and no 2596.sav! So, instead I started up another file which already had a .sav. The game wouldn't boot, and the R4 locked. Reboot...and every .nds and .sav in that directory was GONE, about 400mb worth! (selecting the directory wouldn't even open an empty screen, just wouldn't drill to the next level) When I opened it on the PC with the card reader, the directory appeared to be empty, but the used space on the microSD was 960mb, as if the lost files were still on the microSD. So, that is when I started everything. Formatted the microSD (is FAT32 okay?), added the 1.18 kernel (a copy of what was already on there, as well as a new download). Quit dropping on my themes. At first, it still wasn't retaining the .sav files, but after 1 reboot, it started working! Unfortunately, this was temporary, and eventually an .nds in the directory locked again, and dropped everything in the directory! I am at a loss, as I couldn't find anything on the forums here (or on Google) that matched my experiences. I would appreciate any suggestions as to what is going on? Has my R4 finally died after 18 months of solid service? Is my microSD somehow broken or corrupted? Is the the error between keyboard and chair (me)? Thanks in advance.