Player needs to join brand new server after joining group?

I have been told players have not been getting their group perks after joining the group, and the script will only function after a brand new server is created.

--Give group perks
game.Players.PlayerAdded:Connect(function(newPlayer)
wait(1)   
    if newPlayer:IsInGroup(4071812) and newPlayer:WaitForChild("Data").GroupPerk.Value == false then                    
      newPlayer.leaderstats.Money.Value = newPlayer.leaderstats.Money.Value + 1000
    workspace:WaitForChild(newPlayer.Name).Humanoid.WalkSpeed = 20
      newPlayer.Data.GroupPerk.Value = true    

    newPlayer.CharacterAdded:Connect(function()

    if newPlayer:IsInGroup(4071812) then
    local char = game.Workspace:WaitForChild(newPlayer.Name)

    workspace:WaitForChild(newPlayer.Name).Humanoid.WalkSpeed = 20
    else
        workspace:WaitForChild(newPlayer.Name).Humanoid.WalkSpeed = 16  
    end
    end)
       end

end)

I wanted it to check every single time someone joins