I got 3 random gold keys today, and then just now I got my very first gold key drop from a 3-focus boss.

I suspect that they found an issue affecting some players and gave 3 gold keys as compensation (I should've found a lot more if it had been working, but at least they gave some). No notice to that effect that I could see, though.

Edit: Apparently the 3-keys was one of the event daily rewards? Still, either way, got my very first gold key drop today after a ton of gold box drops.