windows 7 driver geforce 8500gt TV resolution problem

I am running windows 7 32 bit version. I am using geforce 8500gt to connect my monitor and TV. I have extend the desktop through HDMI cable to my 52" sony LCD TV. I have set the resolution for my TV to 1920 x 1080 which should be fully supported by my TV. For some reason, the TV doesnt allow me to change the aspect of screen and the picture mode because it doesnt recognize the PC HDMI input with resolution of 1920 x 1080. However resolution setting still indicate the TV has 1920 x 1080. I have tried loading the latest nvidia driver from nvidia's website directly or let windows 7 automatically search for the driver to install. Either way after the driver is installed and rebooted, my TV will recognized the input as 1920 x 1080 right away and I am able to change the aspect and picture mode. However after maybe half hour, the problem will occur again and doesnt allow me to make aspect and picture mode adjustment. This is very weird as it has never happen before when I was running vista.

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