IPhone 6 Plus camera takes fuzzy pictures?

I notice when looking at the focus screen can see a slight flicker on the screen but it will take a clear picture if I hold down the camera button and try to let go before it takes to many pictures at once… Have any idea what part needs replaced? Thank You…
Added (1). It used to work good before, it is a known problem and there is a recall to have it fixed free of charge but no such luck for mine and there is nothing that tells what part it is that goes bad so I can take normal pictures again, I think it has something to do with auto adjust or balance because of the slight flicker in the focus screen but I don't know what part that would be.

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