Yesterday I wanted to listen to music with my 3ds when I noticed that the amplitude on the beginning screen was going up and down but it was totally quiet in the room. So I checked out the recording of the microphone and it was full of very loud crackling noises but you can hear your voice a bit lower. The crackling sounds like a radio turned on but with no station tuned in. Also the system setting's microphone test brought up a half filled up to a full filled bar when it was quiet. I think it's time for warranty, isn't it?