Yellowing leaves

Some of the leaves on my large Dracaena house plant have started to go yellow. It lives in the lobby by the back door, so I wondered if it doesn't like the draughts of the opening door, or is it lacking something? There are a lot of new leaves growing on it, so it isn't dying. Would be grateful for any advice.
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Thanks for your advice, Philippa.
It's a big plant, have had it for years. The leaves aren't dropping off,just turning yellow. As I've said, there's a lot of new growth coming. Repotted it a couple of years ago so will do it again.
Thanks Edd.