Monitors Techcom LCD tuner goes off every 30 mins

Bought a techcom ssd 723 LCD tuner, its working fine except that every 30-35 mins it drops the signal & screen goes black the tuner itself remain on.

I go into setting & then again search in normal mode with tatasky connected & it tunes & I save the setting but then again 30 mins it happens.

Are my setting not being saved or is the tuner faulty should I get this replaced.

I connected the tatasky via RF out on STB & RF in on the tuner box

will i get better image quality if I use component S-video cable something like this for input to the tuner?



In this case I wont need separate audio convertor.
 
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