Certain 4K games crashing when switching to 4k

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Joined
25 Jan 2009
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480
Location
East Kilbride, Scotland
i all,

Recently got a 4K tv. Was trying some games last night with my 980ti (gta5, bioshock infinite etc) all we’re working flawlessly but when I tried a few older games such as Alan wake and l4d2 the game just crashed as soon as I switched resolution in game. It flickered between the game and desktop ( game wasn’t responding) any ideas what might have caused this.
Two other little problems are that I can play most games in 1440p even though my tv doesn’t support it ? Is this normal ?
And when I try to switch from RGB to ycbcr on the Nvidia Control Panel, the picture flickers a little and just reverts back to RGB ?

Any help would be great thanks, to any of these questions.
 
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