I suggest pairing the remote again. There are usually a number of codes for each TV, and you will find 2 or 3 codes will work correctly , others partially or not at all. So don't just accept the first one that appears to work.
When the TV drops signal or goes balnk do you see any error messages? Are there any specific channels affected by this?
Have you tried re-seating the HDMI cable, or swapping it for another one?
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Does your TV display any error codes when the signal drops? And does the error happen on OnDemand programmes? That's processed by the 360 differently to live TV & recorded content.
If the error is being produced by your 360 losing a live TV feed, there will be an error message/code associated with it. If not, then it's likely meaning the video output is dropping and the TV is detecting a loss of HDMI video input.
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