The flashlighting (screen uniformity) can be addressed with the technician, and they'll be able to speak more to that than I can.
What kind of encryption have you used in your security settings? Try WEP, and use a SSID that doesn't have any spaces or odd characters.
Can the flashlighting problem(upper and lower right corner) be corrected someway?? I have a tech coming out tomorrow to check it out. My set has a build date of 7-10-09 so exchanging thru BB 30day deal would not get me a newer version. Also, I cannot connect to my wireless home network(netgear wndr3300)using the required samsung usb adapter EXCEPT when I disable ALL security on router which I cannot leave that way. Customer service told me to call netgear and they told me to call samsung????? Any good info/solutions would be greatly appreciated. Thank you!