Matrimelee problem?

Hi people.I think I read about this before but I can't remember.Anyway its about my brand new Jap AES copy of Matrimelee.I got it two days ago and while playing for a while it reset on me and today I just started playing for a while and it reset again.It only happened twice but is it a problem with my Cart or is this a common problem with the game? Is there a way to solve this problem? Thanks for your time guys.

No, it's not only you. Many people had this problem before,
I think my Matrimelee copy resetted itself once. That was
my JP copy, my US copy hasn't done it, but then again I don't
play the game that much.