Touched Event work through Script.Parent?

My Studio is really buggy last time... I can't use touched event in Script.Parent sometimes and sometimes I can.. I made a part and did this script which didn't work

script.Parent.Touched:Connect(function()
    print("A")
end)

I putted a script in StarterPlayerScripts which worked fine

local Mesh = game.Workspace:WaitForChild("MeshPart")

Mesh.Touched:Connect(function()
        print("H")
end)

Any idea why?

use a script in ServerScriptService

local part = game.Workspace.Part -- specify ur part
part.Touched:Connect(function(hit) -- see if its been hit
if game.Players:GetPlayerFromCharacter(hit.Parent) then -- check if its a player
    print("A") -- ur stuff
end
end)