Hi im experiencing minor problems like you
I live in the UK, got my PS3 just before Easter and the PS3 seemed to be perfect. However sometimes the PS3 will freeze unexpectedly, this only happens when I quit a game after short play. However what I think could be the problem is the memory cards and USB devices I have connected all at the same time. The LEDs are on constantly, so I've taken them out, haven't really noticed freezing as such. But then again, should it really be freezing at all? I havn't really played on it hardcore because I've got no decent games at the moment.
Luckily I've got a 3-year cover plan. I'd rather swap for a newer one when they come out as soon as possible if someone can confirm this as a problem.