A few years ago for some odd reason I have a Yu-Gi-Oh! Ultimate Masters: World Championship Tournament 2006 gba that restarted and erased my entire save data and it did to me again like a year ago. So to today just for the heck of it I decided to unscrew it to see if it needed a battery change or something but the game does not use one and has this happend to anyone else? Also what do I do? So far I just been playing it on it on my phone on a emulator and I am close to completing it . Also today I decided to replay the orginal gba one and so far it is saving but I do not think it will last for very long.