Changing the WalkSpeed of a pathfinding AI causes it to stutter

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I am trying to make a pathfinding ai that can become faster at random intervals. However, if I try to change the walkspeed, it starts stuttering, despite it working perfectly normally if it was set to that before actually testing. This makes it so that the boost isn’t as fast as it was intended to be, and instead just a slightly faster version of the AI.

I tried looking to find a reason as to why this happens but I can’t seem to find any, and i’ve tried a ton of solutions.

The AI is 2 seperate scripts, 1 in the NPC and 1 in ServerScriptService, which answers for pathfinding.

-- Module script in serverscriptservice
local pathService = game:GetService("PathfindingService")
local pathFinding = {}

function pathFinding.moveTo(ai, position)
	local humanoid = ai:FindFirstChild("Humanoid")
	local humanoidRootPart = ai:WaitForChild("HumanoidRootPart")
	local path = pathService:CreatePath()
	
	local success, err = pcall(function()
		path:ComputeAsync(humanoidRootPart.Position, position)
	end)
	
	if success and path.Status == Enum.PathStatus.Success then
		local waypoints = path:GetWaypoints()
		local index = 2
		
		humanoid:MoveTo(waypoints[2].Position)
		
		local finish = humanoid.MoveToFinished:Connect(function(certificate)
			if certificate and index < #waypoints then
				index += 1
				humanoid:MoveTo(waypoints[index].Position)
			end
		end)
		
		--[[for i,v in pairs(waypoints) do
			waypointd = Instance.new("Part")
			waypointd.Size = Vector3.new(1,1,1)
			waypointd.Anchored = true
			waypointd.Position = waypoints[i].Position
		end]]
	end
end

return pathFinding

--Script in the npc
local pathFind = require(game:GetService("ServerScriptService"):FindFirstChild("PathFinding"))
local AI = script.Parent
local humanoidRootPart = script.Parent.HumanoidRootPart
local humanoid = script.Parent.Humanoid

humanoidRootPart:SetNetworkOwner(nil)
task.spawn(function()
	while task.wait(math.random(700,1300)/100) do
		humanoid.WalkSpeed = 36
		task.spawn(function()
			task.wait(3.5)
			humanoid.WalkSpeed = 16
		end)
	end
end)

while task.wait(0.05) do
	local targetPlayer = nil
	local distance = 5000

	for i,v in pairs(game:GetService("Players"):GetPlayers()) do
		if v:IsA("Player") then
			if v.Character then
				if v.Character.Humanoid.Health >= 1 then
					newDistance = (v.Character:WaitForChild("HumanoidRootPart").Position - humanoidRootPart.Position).Magnitude
					if newDistance <= distance then
						distance = newDistance
						targetPlayer = v.Character
					end
				end
			end
		end
	end

	if targetPlayer ~= nil then
		pathFind.moveTo(AI,targetPlayer.PrimaryPart.Position)
	end
end
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