[AWNSERED]Why does the model just break apart?

local ship = script.Parent
local PP = script.Parent.PrimaryPart

function sink()
    script.Parent.button.ClickDetector:Destroy()
    for i= 1,50 do
        wait()
        ship:SetPrimaryPartCFrame(PP.CFrame * CFrame.fromEulerAnglesXYZ(0,0,-.0025))
    end
    for i= 1,50 do
        wait()
        ship:SetPrimaryPartCFrame(PP.CFrame * CFrame.fromEulerAnglesXYZ(0,0,.005))
    end
    for i= 1,50 do
        wait()
        ship:SetPrimaryPartCFrame(PP.CFrame * CFrame.fromEulerAnglesXYZ(0,0,-.003))
    end
    for i= 1,25000 do
        wait()
        ship:SetPrimaryPartCFrame(PP.CFrame - Vector3.new(0,.001,0) )
        ship:SetPrimaryPartCFrame(PP.CFrame * CFrame.fromEulerAnglesXYZ(-.000006,0,-.000009))
    end
    for i= 1,500 do
        wait()
        ship:SetPrimaryPartCFrame(PP.CFrame - Vector3.new(0,.01,0))
        ship:SetPrimaryPartCFrame(PP.CFrame * CFrame.fromEulerAnglesXYZ(-.0001,0,-.0001))
    end
    for i= 1,17000 do
        wait()
        ship:SetPrimaryPartCFrame(PP.CFrame - Vector3.new(0,.05,0))
        ship:SetPrimaryPartCFrame(PP.CFrame * CFrame.fromEulerAnglesXYZ(0,0,-.001))
    end
end

script.Parent.button.ClickDetector.MouseClick:Connect(sink)

context: i've been making this script for a sinking ship game but the model breaks apart