How come this works sometimes? PlayerAdded/CharacterAdded??

Seems to work fine, then sometime doesn't even work at all?

game.Players.PlayerAdded:connect(function(player)
local Data = script.Data:Clone()
Data.Parent = player
local CopyData = script.Data.leaderstats:Clone()
CopyData.Parent = player
    --stat() 
    player.CharacterAdded:connect(function(char)    
    if char:WaitForChild("Humanoid") then
        update()    
        wait(6)
        Change_Clothes(char);
        Insert_FallDmg(char); -- Enables Damage_On_Fall 
        Insert_Ragdoll(char); -- Enables Death_Animation
        Insert_Blood(char);
        Insert_Sprint(char);
        Hat_Despawn(char)
        if isAuthenticated(player) then
        print(player.Name .. " has bought the game pass with id " .. passId)
        game.ReplicatedStorage.Weapons.M1014:Clone().Parent = player.Backpack
        player.Data.Inventory.M1014.Value = 1
        char.Humanoid.MaxHealth = char.Humanoid.MaxHealth + 50
        char.Humanoid.Health = char.Humanoid.Health + 50
        end
    end
    end)
    --setupPlayerData(player)   
    CheckBadges(player)
end)