Hi, I have a Fender Strat and I'm getting string buzz on D and G string. I have switch my string gauge to 10's and still getting string buzz even oon open string. Neck radius is 9.5, both low E and high E strings are set to height about 2.0 mm. and D and G strings are almost 2.5 mm, and I'm still getting buzz. Neck relief is almost straight, any help or suggestion is welcome and appreciated very much.

It could be one or more of these reasons-
Too little neck relief, badly cut nut, bad saddles, pickups too high.

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No no and no

What string gauge did you have on before you switched?

I agree with niki and lean towards the nut slots as the culprit.

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So, you fret a note anywhere on those two strings and you're still getting a buzz?