Mine has done that before. It's pretty freaky, but can be fixed easily by buying new batteries. But my Angelgotchi is doing even crazier thing: it's been three months from since I got the BATT sign (it indicates that the batteries are running low). My Angelgotchi made a long beep, the screen blinked a bit, and then it went quiet. I put it back to my Tamagotchi box, where I store my battery-less Tams. After a couple of weeks, I hear another strange long beep. It came from the Tamagotchi box! My Angelgotchi was beeping like crazy. I was pretty frightened; the batteries were supposed to be dead! Then it stopped. And after another week, my Angelgotchi did that same beep sequence. It's pretty weird!