Warzone Firefight enemies not spawning

This has happened a lot over the past few days, but this is the first time it cost me a match. Halfway through the first round of legendary Warzone Firefight, enemies just stop spawning. This ended up costing me the game and an RP boost because we couldn’t reach the kill limit. Please take a look at this…would be nice to get that boost back…

I believe this issues happens sometimes if you are too quick to clean out a group of enemies. Don’t have the exact timings, but try leaving at least one alive for a little longer and see if that helps for spawning in the next waves