Which server software are you using?
I just bought a 46inch Series 7 LED TV and it's great.
I'm having issues with the wireless - it will connect fine, but now whenever I try to view my files it disconnects the wireless then my server disappears as a device on the DLNA screen. I have been able to watch a couple videos (with the same shares) with no problem. Now it keeps disconnecting. Once it disappears from the device list I have to turn the TV off and on again.
My computer is running Vista. The wireless network is working fine on my computer and iphone etc.
Any help would be appreciated.