Why is the datastore telling me to send fewer requests?

Hi, I made a simple datastore script.

local DSS = game:GetService("DataStoreService")
local SFKDSS = DSS:GetDataStore("SFKDSS")
local SFDDSS = DSS:GetDataStore("SFDDSS")

game.Players.PlayerAdded:Connect(function(player)
    local leaderstats = player:WaitForChild("leaderstats")
    local Kills = leaderstats:WaitForChild("Kills")
    local Deaths = leaderstats:WaitForChild("Deaths")

    Kills.Value = SFKDSS:GetAsync(player.UserId, Kills.Value)
    Deaths.Value = SFDDSS:GetAsync(player.UserId, Deaths.Value)
end)

game.Players.PlayerRemoving:Connect(function(player)
    local leaderstats = player:WaitForChild("leaderstats")
    local Kills = leaderstats:WaitForChild("Kills")
    local Deaths = leaderstats:WaitForChild("Deaths")

    SFKDSS:SetAsync(player.UserId, Kills.Value)
    SFDDSS:SetAsync(player.UserId, Deaths.Value)
end)

game:BindToClose(function()
    for _, player in pairs(game.Players:GetPlayers()) do
        local leaderstats = player:WaitForChild("leaderstats")
        local Kills = leaderstats:WaitForChild("Kills")
        local Deaths = leaderstats:WaitForChild("Deaths")

        SFKDSS:SetAsync(player.UserId, Kills.Value)
        SFDDSS:SetAsync(player.UserId, Deaths.Value)
    end
end)

But when I leave the game in Studio, I get this error

22:10:53.883 DataStore request was added to queue. If request queue fills, further requests will be dropped. Try sending fewer requests.Key = 461604490

I'm not sure why, someone please explain and present a solution. Thanks!