DataStore request was added to queue. If request queue fills, further requests will be dropped?

I am having the above error when trying to save player's clothes. When you click on the surfaceGUI "Buy Clothes" (TextButton), this script gets run:

local ds = game:GetService("DataStoreService"):GetDataStore("ClothesStore1")

game.Players.PlayerAdded:Connect(function(player)

	local key = "clothes-"..player.UserId
	
	local folder = Instance.new("Folder")
	folder.Name = "Clothes"
	folder.Parent = player
	
	local current = Instance.new("StringValue")
	current.Name = "CurrentClothes"
	current.Parent = folder
	
	local shirt = Instance.new("StringValue")
	shirt.Name = "Shirt"
	shirt.Parent = current

	local pants = Instance.new("StringValue")
	pants.Name = "Pants"
	pants.Parent = current
	
	local save = ds:GetAsync(key)

	if save then
		for i = 1, #save do
			if game.ServerStorage.Clothes:FindFirstChild(i) then
				local clone = game.ServerStorage.Clothes:FindFirstChild(save[i]):Clone()
				clone.Parent = folder
			end
		end
	end

	player.CharacterAdded:Connect(function(character)
		if shirt.Value ~= "" then
			character:WaitForChild("Shirt").ShirtTemplate = shirt.Value
			character:WaitForChild("Pants").PantsTemplate = pants.Value
		end
	end)
end)

game.ReplicatedStorage.BuyClothes.OnServerEvent:Connect(function(player, shirt, pants, cName)

	local key = "clothes-"..player.UserId
	
	player.Character.Shirt.ShirtTemplate = shirt
	player.Character.Pants.PantsTemplate = pants
	player.Clothes.CurrentClothes.Value = cName
	player.Clothes.CurrentClothes.Shirt.Value = shirt
	player.Clothes.CurrentClothes.Pants.Value = pants

	local clothes = game.ServerStorage.Clothes:FindFirstChild(cName):Clone()
	clothes.Parent = player.Clothes

	local saved = {}

	for i,v in pairs(player.Clothes:GetChildren()) do
		if v.Name == "CurrentClothes" then
			table.insert(saved, v.Name)
			ds:SetAsync(key, saved)
		end
	end
	
end)

What is this script supposed to do?

Well, this script saves the players clothes which he bought and then when the player re-joins the game, the clothes should be saved.

So what is the problem?

Whenever the player leaves the game, the output shows this message "DataStore request was added to queue. If request queue fills, further requests will be dropped. Try sending fewer requests.Key = clothes-443643048"

And then it does not save the clothes.

I think that this problem is because of the queue of the keys is filled.

How do I resolve this issue?

Thanks