I'm not confident enough to try to mess with the electronics, but my DMX B version (the new As Maria shell) randomly turns off on it's own after a while. I tried replacing the battery a few times already. Sometimes a good smack works, but I lose a lot of time as it's the same as my Digimon being frozen. Also, one of my color devices has a messed up speaker.
Anyone know of someone who does repair work on these?