Half of the time this script doesn't work, why?

names = {"Alpha","Bravo","Gama","Kilo","Foxtrot","Papa","Zulu","November","Yankee","Newb","Bond","Winter"}

wait(0)
function handout()
for i,v in pairs(game.Players:GetChildren()) do
if workspace:FindFirstChild(v.Name) then
c = BrickColor.Random()
local b = Instance.new("BillboardGui",workspace[v.Name].Head)
b.Size =UDim2.new(6,0,2,0) b.StudsOffset = Vector3.new(0,5.5,0)
local text = Instance.new("TextLabel",b) text.Size = UDim2.new(1,0,1,0) text.Text = names[math.random(1,#names)] 
text.TextColor3 = c.Color text.TextScaled = true text.BackgroundTransparency = 1
for t,k in pairs(workspace[v.Name]:GetChildren()) do
if k:IsA("Part") and k.Name ~= "HumanoidRootPart" then
if k.Name == "Torso" then
k.BrickColor =  c
else
k.BrickColor = BrickColor.new("Cool yellow")
end
elseif k:IsA("Shirt") or k:IsA("Pants") then
k:Destroy()
elseif k:IsA("Hat") then
if k:FindFirstChild("Handle") then
k.Handle:Destroy()
end
elseif k:IsA("CharacterMesh") then
k:Destroy()
end
end
end
end
end

for i = 10,0,-1 do
wait(.7)
print(i)
end

handout()

1 time it works, another it doesn't. PLEASE FIX IT!