Is this a vintage one? I have a 1997 Koala Giga Pet. Other than having a broken speaker, it works ok, yet it always gets dirty and needs a bath. No matter how many times I bathe it, its still dirty. It has that cloud of dust floating around it. Its quite aggravating. I hardly ever play with it, I keep it as a keep sake as it was from my Nana.
From experience, I think vintage Giga Pets are much more glitchier than vintage Tamagotchis. I even had a 1997 Giga Frog explode while i changed the batteries!