Why does the camera glitch when trying to go back into player?

So i'm making a drone. I scripted the movement, ect. The camera does attach to the part. When I try to go to the player, it just glitched out. I'm assuming it's coming from the loop. I've tried fixing this myself by removing the loop, which does work, but it only works once.

code:

plr = game.Players.LocalPlayer
cam = game.Workspace.CurrentCamera
chr = nil

plr.CharacterAdded:connect(function(character)
    chr=character
end)


script.Parent.Camera.MouseButton1Click:connect(function()
    if debounce == true then
        debounce = false
        while true do
            wait()
            cam.CoordinateFrame = CFrame.new(game.Workspace.Model.Part.Position)
            cam.CameraType = "Scriptable"
        end
    end
end)

script.Parent.BackToPlayer.MouseButton1Click:connect(function()
    while true do 
        wait()
        cam.CameraType = "Custom"
    end
    debounce = true
end)

If you have any questions, please put them in the comment