that happened to me once and i put it on traveling and shook my tamagotchi up and down for around 5 mins and it may work DISCLAIMER:may not work 4 every1 i hav the pink one that says ' i love my Familitchi'
ive already got v5 its really cool it has a bigger screen and everything my friend is in japan and she said v6 is coming out there and shes going to send me one i am a lucky duck! :P -_-