I also had issues with a PS3 over wireless (dlna errors etc), and tried lots of so called solutions from the internet, all failed miserably, so in the end I bit the bullet and bought a couple of Solwise Homeplugs (200Mbps) and since then no issues connecting to the internet, streaming HD movies etc well worth it and only about 10mins to set up.
http://www.solwise.co.uk/net-powerline.htm
Dave
PS if you are worried about taking up power sockets you can get piggy back units that allow mains connections to pass thru':-
http://www.solwise.co.uk/net-powerli...-piggy-mk2.htm