Why is my script stopping at a certain time?[SOLVED]

First: tab your code correctly

Now, various other style improvements

• Use a variable for the long pieces of text instead of repeating them twice in the code
• Use the string methods instead of string.

Now that the code is properly tabbed, we can see there's an obvious problem:

		local text = "Commander: If you want to go weewee in your big boy slacks, now's the time."
		for i = 1, #text do
			wait(0.1)
			script.Parent.Text1.Text = text:sub(1, 4) -- Stops at 'C' in commander.
			wait(4)
			game.Workspace.Text1Ready.Value = false
			game.Workspace.Loading1.Value = true
			game.Workspace.Talking.Value = false
			for i,v in pairs(game.Workspace:GetChildren()) do
				if v:IsA("Sound") then
					v:Stop()
				end
			end
		end

You're doing a bunch of stuff inside the for loop for the text. You should be doing it after the for loop (this is why we tab our code correctly).

You show a message character by character three times (maybe you'll do it more?) so you should use a function to do that:

e.g.,

	if game.Workspace.Text2Ready.Value == true then
		game.Workspace.Typewrite:Play()
		script.Parent.DarkScreen.Visible = false
		say("Commander: Because if not, we can take you back to where you came from.")
		wait(4) 
		say("Commander: If you want to go weewee in your big boy slacks, now's the time.")
		wait(4)
		game.Workspace.Text1Ready.Value = false
		game.Workspace.Loading1.Value = true
		game.Workspace.Talking.Value = false
		for _ ,v in pairs(game.Workspace:GetChildren()) do
			if v:IsA("Sound") then
				v:Stop()
			end
		end
		script.Parent.Text1.Visible = false
		script.Parent.Text2.Visible = false 
	end

Now it's not even possible to make the mistake you made before.

I would suggest a different organization for your code. Everything in a big while loop doesn't really capture what you want to do. Neither do a new BoolValue for every transition.

Consider doing something like this instead:

function say(text)
	for i = 1, #text do
		wait(0.1)
		script.Parent.Text1.Text = text:sub(1, i)
	end
end

function scene1()
	script.Parent.Text1.Visible = true
	say("Command: Hello Soldier, are you ready?")
	game.Workspace.Talking.Value = false
	script.Parent.Text2.Visible = true
	script.Parent.Text2.Text = "CLICK ANYWHERE TO CONTINUE"
	script.Parent.DarkScreen.Visible = true
	game.Workspace.Typewrite:Stop()
	script.Parent.DarkScreen.MouseButton1Down:wait()
	script.Parent.Text2.Visible = false
end

function scene2()
	game.Workspace.Typewrite:Play()
	script.Parent.DarkScreen.Visible = false
	say("Commander: Because if not, we can take you back to where you came from.")
	wait(4) 
	say("Commander: If you want to go weewee in your big boy slacks, now's the time.")
	wait(4)
	game.Workspace.Loading1.Value = true
	game.Workspace.Talking.Value = false
	for _ ,v in pairs(game.Workspace:GetChildren()) do
		if v:IsA("Sound") then
			v:Stop()
		end
	end
	script.Parent.Text1.Visible = false
	script.Parent.Text2.Visible = false 
end

scene1()
scene2()