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I would guess the same thing... mag release is worn, or you got a crap one.
Often, a worn mag catch can be troubleshot if you push the mag up into the gun. If it fires fine like you said than usually it's the mag catch. If it's not the mag catch, it may be the gas routing rubber that's worn out.
In your case it's all very odd cause you said it's a brand new gun.
If you have access to another mag and another gun, I'd try a different mag in your gun, and then try your mag in another gun. Then you can narrow down what's causing the issue.
If you're in need of a new mag catch, I'd suggest an AIP one. It's aluminum, so it's less likely it won't mess up your mags like a steel one from Guarder.
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