Are both your BD player and TV doing the same exact thing?
I have not been able to keep wifi going on my BD-C7900. It connects fine with any connection method (WEP, passphrase or pin). However it is always lost and has to be completely reconfigured every time the power is turned off. I had a C6900 with the same problem after multiple tech support calls they told me the unit was defective. So I got the C7900 with same results. I also got a dongle to see if it worked better and got exactly the same thing with both the bluray and my PN63C8000 connected to it. They all connect fine but lose connection and all info after it shuts down. I must be doing something wrong since I have not found anything about this anywhere. I have a Linksys E3000 router and charter internet. I have tried static IP address but never get that to work. I may be doing that wrong I guess. Any suggestions.