You must be browsing some highly objectable site(s) for your router to kick you out !
A good catholic girl like me??? Never!!
Seriously, I think the router is the most likely suspect for the moment. That comment talks about some added security feature. What exactly does it do ?
Well let's see, on the Mac sometimes it drops the wi-fi connection completely - but not the internet connection - so when it re-connects a few seconds later, it's online straight away, and not going through the internet negotiation again, which would take a lot longer.
Then, pretty much every time i use the PS3, i get some kind of error message, either about the PS Store or about some connection error. Pretty much every time i connect through the PS3 Media Server, at some point it will drop out while watching a video, screen goes black with either a 'cannot play media' or 'file corrupted' kind of message. After this, it will just not reconnect to anything until i turn the PS3 and the router off (i usually turn the Mac off too, just to be safe).
It's just messy and not cool at all, especially because i never had any problems, even when the router was on the other side of the flat - now it's in the same room of the PS3 and the Mac, and i have problems!? Not good.
PS: I should add that my Mac sees at least 15 other networks in my buildings, can interference affect my connection so much?