For the past few days, I have been unable to earn any killstreak rewards from any of the 3 packages (specialist, assault, and support). I have selected rewards in my custom classes and they do show up under my perks & to the left of my death streak. When I enter games, my killstreak slots shown on the lower right hand side of the screen are blank, despite being chosen. I am positive I earn enough kills, as even when I have UAV selected with the support package I do not earn UAV after getting 15+ kills in the game. I play a lot of drop zone and I am able to use the kill streaks from care packages.

My Xbox has all required system & game updates installed. What should I do?