Why my data saving scripts sometimes work but most of times not?

local dataStoreService = game:GetService("DataStoreService")

local timeData = dataStoreService:GetDataStore("TimeData")

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

local leaderstats = Instance.new("Folder",player)
leaderstats.Name = "leaderstats"
local Time = Instance.new("IntValue",leaderstats)
Time.Name = "Time"
local success , getValue = pcall(function()
    return timeData:GetAsync(player.UserId) or 0
end)
if success then
    print("the load was successful")
else
    warn(getValue)
end
Time.Value = getValue
print ("Loaded Value "..getValue)

game.Players.PlayerRemoving:Connect(function(player)
    local succes , erra = pcall(function()
        timeData:UpdateAsync(player.UserId,function(wtf)
            if Time.Value > wtf then
                return Time.Value
            end
        end)
    end)
    if not succes then
        warn(erra)
    end
    print(player.Name.." has left the server".."("..player.UserId..")")
end)

end)