It seems that since the latest PS3 update (1.8) I am getting logged out a lot, thoughts? ne1 else seeing this?

I am set to log in at start up, used to be almost instantaneous, not takes 45 - 60 secs. Keep getting an error message "DNS error" (I think - to best of my memory) and will get logged out. Almost every time I go into online section of any game I will get logged out. I have not moved my wi-fi transmitter, so don't think it is a reception issue. When connected, speed is great - able to watch streaming video fine. Is this just a coincidence that problem started around update? Known bugs/issues? Fixes?