my data only saves half the time?

only half the time in roblox studio does the game save my deaths and kills and print "data saved" when i leave. The other half of the time it doesn't print anything. please help.

local dataStoreService = game:GetService("DataStoreService")
local myDataStore = dataStoreService:GetDataStore("myDataStore")

game.Players.PlayerAdded:connect(function(player)
	
	local leaderstats = Instance.new("Folder",player)
	leaderstats.Name = "leaderstats"
	
	local kills = Instance.new("IntValue",leaderstats)
	kills.Name = "Kills"
	
	local deaths = Instance.new("IntValue",leaderstats)
	deaths.Name = "Deaths"
	
	
	local dataSave
	local success, errormsg = pcall(function()
		dataSave = myDataStore:GetAsync(player.UserId)
	end)
		
	if success then
		deaths.Value = dataSave.deaths
		kills.Value = dataSave.kills
	else
		warn(errormsg)
		print("Data not saved")
	end
end)

game.Players.PlayerRemoving:Connect(function(plr)

	local oldDataSave = {
		deaths = plr.leaderstats.Deaths.Value;
		kills = plr.leaderstats.Kills.Value;
	}
	

	local success, errormsg = pcall(function()
		myDataStore:SetAsync(plr.UserId,oldDataSave)
	end)
	
	if success then
		print("Data saved")
	elseif errormsg then
		print("Data not saved")
		warn(errormsg)
	end
end)

I'm renewing your code

local code = game:GetService('DataStoreService'):GetDataStore('0')
local default = {Kills = 0, Deaths = 0}
local data = {}

function inckills(player, number)
	data[player.Name].Kills = data[player.Name].Kills + number
	print(data[player.Name].Kills)
end

function incdeaths(player, number)
	data[player.Name].Deaths = data[player.Name].Deaths + number
	print(data[player.Name].Deaths)
end

game.Players.PlayerAdded:Connect(function(player)
	data[player.Name] = code:GetAsync(Player.UserId) or default

	inckills(player, 2)
	incdeaths(player, 2)
end)

game.Players.PlayerRemoving:Connect(function(player)
	code:SetAsync(Player.UserId, data[player.Name])
	data[player.Name] = nil
end)