The rice seeds get to heavy when it cook, because they suck the water so 600g rice seeds become about 1.3kg rice after cook.
I was given this used rice cooker from my friend and have used this since 1993, Japanese products are really long life and don't break, I think.
If this cooker broke it maybe impossible to fix because probably there are no parts to repair in the produced campany.
If it goes I have to buy new one but I'll feel something sad.