Canon 5d4 not focusing in low light

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Diannanz New Member • Posts: 1
Canon 5d4 not focusing in low light

Hi I've been having an increasing problem with my canon mark 4 where it doesn't focus when the light gets low and the ISO gets higher. It photographs perfectly fine on a sunny day. As the light goes it misses its focus more and more. It is focusing  the viewfinder however the photo is not in focus. Canon have looked at it twice and don't see a focusing issue. Has anyone else had this problem? Help this is sending me crazy!

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