WaitForChild 'Infinite Yield Possible', Help?

Hi, I've been having a lot of trouble over the past days trying to figure this out but nothing is working. I've tried to look for understanding on what it means by infinite yield is possible, and I've tried so much, but nothing is working. Here is my script.

for i, player in pairs (game.Players:GetPlayers()) do
player.PlayerGui:WaitForChild('playerInterface')
end

function Intermission(TextValue)
for i, player in pairs (game.Players:GetPlayers()) do
if player:FindFirstChild("PlayerGui") and player:FindFirstChild("PlayerGui"):FindFirstChild("playerInterface") then
    player.PlayerGui.playerInterface.intermission.Text = tostring(TextValue)
end
end

Whenever I dont put in the WaitForChild() the gui doesnt work, when I do put it in, an Infinite Yield comes up and the script itself entirely breaks. However, I found a solution, but then whenever I would be to reset my character, It would completely remove the GUI ( I used clone(). ) This is in a regular script.

Any help would be much appreciated, thank you for your time reading this.