Sprint not working after death. Help?

I am configuring a Stamina Gui. Sprinting, Field of view, and moving stamina bar works. But, when I die, sprinting doesn't work. Every other else work, but the sprinting stop working. I need help.

local camera = game.Workspace.CurrentCamera

local TweeningService = game:GetService("TweenService")

local UIS = game:GetService('UserInputService')

local Bar = script.parent:WaitForChild('STMBackground'):WaitForChild('Bar')

local player = game.Players.LocalPlayer

local NormalWalkSpeed = 16
local NewWalkSpeed = 50

local power = 10

local sprinting = false

repeat wait() until game.Players.LocalPlayer.Character

local character = player.Character


-- sprinting

        local FOVChanges = {
            FieldOfView = 90
        }
        local TweenInformation = TweenInfo.new(
            1, --tween length
            Enum.EasingStyle.Quint, --easing Style
            Enum.EasingDirection.Out, --easing Direction
            0, --repitition time
            false, --reverse?
            0 --delay               
        )

        local tween = TweeningService:Create(camera,TweenInformation,FOVChanges)

-- walking

        local FOVChanges2 = {
            FieldOfView = 70
        }
        local TweenInformation2 = TweenInfo.new(
            1, --tween length
            Enum.EasingStyle.Quint, --easing Style
            Enum.EasingDirection.Out, --easing Direction
            0, --repitition time
            false, --reverse?
            0 --delay               
        )

        local tween2 = TweeningService:Create(camera,TweenInformation2,FOVChanges2)


UIS.InputBegan:connect(function(key, gameProcessed)
    if key.KeyCode == Enum.KeyCode.LeftShift and gameProcessed == false then
        character.Humanoid.WalkSpeed = NewWalkSpeed
        sprinting = true
        while power > 0 and sprinting do
            power = power - .03
            Bar.Size = UDim2.new(power / 10, 0, 1, 0)
            --Bar.BackgroundColor3 = Bar.BackgroundColor3:lerp(Color3.fromRGB(255, 42, 42), 0.001)
            tween:Play()
            wait()
            if power <= 0 then
                character.Humanoid.WalkSpeed = NormalWalkSpeed
            end
        end
    end
end)

UIS.InputEnded:connect(function(key, gameProcessed)
    if key.KeyCode == Enum.KeyCode.LeftShift and gameProcessed == false then
        character.Humanoid.WalkSpeed = NormalWalkSpeed
        sprinting = false
        while power < 10 and not sprinting do
            power = power + .03
            Bar.Size = UDim2.new(power / 10, 0, 1, 0)
            --Bar.BackgroundColor3 = Bar.BackgroundColor3:lerp(Color3.fromRGB(255, 166, 11), 0.001)
            tween2:Play()
            wait()
            if power <= 0 then
                character.Humanoid.WalkSpeed = NormalWalkSpeed
            end
        end
    end
end)
game.Players.LocalPlayer.Character:WaitForChild("Humanoid").Died:connect(function()
    game.Workspace.Camera.FieldOfView=70
    game.Players.LocalPlayer.Character.Humanoid.WalkSpeed=16
end)