Is Double Points intentionally programmed to drop when there’s 3 or less zombies left?

In BO6 zombies it feels like I get more 2X drops at the end of a round rather than actually in the middle of one. I kill the remaining zombies, wait until it blinks rapidly, and then manage to get only like 6 kills because the zombies take too long to spawn in the next round. Anyone else feel like this or is it just my luck?