When using the Exotic Submachine Gun, Risk Runner - a common reoccurring issue is when there are many enemies bundled together, the exotic feature is chaining lighting between enemies for extended damage often results in an error in the game. Kicking the player to Start Screen with error code BIRD. This is the only weapon that causes this issue from what I could observe. Additionally using Chaos Reach with too many enemies can also result in this issue. This is common in Gambit, Strikes and Override. Essentially any activity that has many enemies bundled together. Perhaps the server cannot update quickly enough for the kills to register? Regardless, this is a common reoccurring issue with Risk Runner and perhaps having a look exactly what causes it can find a solution? Not to sound slack but if the answer is just ‘kill less’ then that defeats the purpose of being a Destiny player.