MBP to TV using a cable - TV screen greys out after 10-15 mins

Hi there, I am looking for some assistance to solve the following issue that I cannot seem to resolve,
I have my Macbook Pro (OS 10.8.5) hooked up to my 42' Philips TV (Model 42PFL560AH) using Belkin Mini DisplayPort to HDMI Cable. I then go to displays settings on my Mac and mirror displays and I then have audio and video on the TV and everything is working fine.
The problem I have is if I stream video from the web, the TV screen  'greys out' every 10-15 mins or so and I then have to go to my display settings on my Macbook Pro and change the refresh rate. I change between PAL & NTSC or visa versa and I am then good for another 10-15mins.
I do not know if this problem is Mac or TV model related.
Any help or suggestion is appreciated as this is doing my head in.
Regards,
Celtictiger

Soundls like it is working. Try dragging a window on the MBP to the edge of the screen and see if it appears on the TV.
There are two ways to set up the TV one is to mirror the MBP display and the other is to be an extension of the MBP's screen.
You change the settings in System Preference->Display

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