My third SMY SDNA200 failed last week. The fuse has blown on this one. The previous two were replaced on warranty, so I didn't investigate why they failed. On both the screen said warranty repair, or warranty service, I don't remember. This last one was rarely used, it sat under my monitor, fully charger with an aeronaut dripper attached. I was reading something on the computer and a small puff of vapor came out of the atty, and a burned circuit board smell. I quickly removed the atty in case the battery had failed, but the mod and atty were both cold. The screen was dead, when I plugged it into the usb it immediately shut down my computer. I'm so over these mods. None of them lasted longer than six weeks.