Soy Lattes - why does soy milk curdle?

I've been having some trouble as of late with my espresso curdling my steamed soy milk. Any ideas on how to remedy this? I've tried Silk brand, 8th Continent, + generic brands - they all have slightly different texture, but they all still curdle when they hit the espresso. Almond milk mixes perfectly with a nice consistency, but not the soy.

Thanks for your help!

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