Changing Camera CoordinateFrame disables character movement?

As soon as CoordinateFrame is changed, the player stops being able to move, but can still jump in place, any reason as to why, or can anyone suggest a fix?

Current Script:

local RS = game:getService('RunService')
local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()
local Cam = workspace.CurrentCamera
repeat wait() until Player.Character
Player.Character:WaitForChild('Head')
Player.Character:WaitForChild('Torso')
local Character = Player.Character

wait(2)
Cam.CameraType = 'Scriptable'
wait(2)
local CamPart = Instance.new("Part",workspace)
CamPart.Anchored = true
CamPart.CanCollide = false
CamPart.Transparency = 1
CamPart.CFrame = CFrame.new(Character.Head.Position + Vector3.new(0,20,0),Character.Head.Position)
wait(2)

    Cam.CoordinateFrame = CamPart.CFrame
    wait(3)
    Cam.focus = CamPart.CFrame * CFrame.new(0,-1,0)
    wait(1)
    CamPart.CFrame = CFrame.new(Character.Head.Position + Vector3.new(0,20,0),Character.Head.Position)