only strange behaivour i mentioned one time that i started the ps3 over the controller and the controller keeps searching while the ps3 is fully started. connected it over the cable and it works again.
This is what I think because it happen to me. On firmware 2.0, when information bar try to access headline from the internet, any thing you try to access either system setting or play game will lag or freeze. I turn that off and everything is fine.
I had problems accessing the PS store before, it loaded incomplete pages and corrupt icons before the update. Now that I am on 2.0 everything is fine, sometimes the information bar makes the xmb lag for a second while it connects to the internet, but I just turn it on when I want to check on it, and then quickly turn it off.