Why does my zombie stand still for a few seconds?

I made a script that checks if players are nearby, and which one is closest. Then it sees if the player is close enough to attack. If not, then it sees if the player is within line of sight of the zombie and if it is, it walks straight there, but if it isn't, it uses path finding service to get there

My problem is that occasionally, the zombie will just stand still for a few seconds. I believe that the issue happens when the nearest player goes in/out of the line of sight. Any ideas as to why this could be happening? Thank you for your time! This is the section which I believe is giving me the issue:

--Do Zombie Stuff
local function DoZombStuff()
    NearestPlr=nil
    NearestDist=1000
    NearestLoc=nil
    --Check if players are nearby/Closest player
    for i,v in pairs(game.Players:getChildren()) do
        if v.Character~=nil and v.Character:findFirstChild("HumanoidRootPart") and v.Character:findFirstChild("Humanoid") and v.Character.Humanoid.Health>0 then
            if (v.Character.HumanoidRootPart.Position-HRP.Position).magnitude<NearestDist then
                NearestPlr=v.Character
                NearestDist=(v.Character.HumanoidRootPart.Position-HRP.Position).magnitude
                NearestLoc=NearestPlr.HumanoidRootPart.Position
            end
        end
    end
    --Create ray
    if NearestPlr~=nil then
        local Hit
        local raycastParams = RaycastParams.new()
        raycastParams.FilterType = Enum.RaycastFilterType.Blacklist
        raycastParams.FilterDescendantsInstances = {script.Parent.Parent,workspace:WaitForChild("Explosions")}
        raycastParams.IgnoreWater = true
        local Ray=workspace:Raycast(HRP.Position, (NearestPlr.HumanoidRootPart.Position-HRP.Position).Unit*200, raycastParams)
        if Ray and Ray.Instance then
            Hit=Ray.Instance
        end
        --Attack
        if (NearestLoc-HRP.Position).magnitude<=AttDist+1 and ADB==false and Humanoid.Health>0 then
            ADB=true
            Humanoid:MoveTo(HRP.Position,NearestPlr.HumanoidRootPart)
            wait(.1)
            HRP.CFrame=CFrame.new(HRP.Position,Vector3.new(NearestLoc.X,HRP.Position.Y,NearestLoc.Z))
            if NearestPlr:findFirstChild("Humanoid") then
                NearestPlr.Humanoid.Health=NearestPlr.Humanoid.Health-dmg
            end
            ThrowAnimationTrack:Play()
            wait(AttackCoolDown)
            ADB=false
            --In LoS
        elseif Hit~=nil and (Hit.Parent==NearestPlr or Hit.Parent.Parent==NearestPlr) and (NearestLoc-HRP.Position).magnitude>=AttDist then
            Humanoid:MoveTo(NearestLoc)
            --Pathfind
        elseif (NearestLoc-HRP.Position).magnitude<=1000 and (NearestLoc-HRP.Position).magnitude>=AttDist then
            local path=game:GetService("PathfindingService"):findPathAsync(HRP.Position,NearestPlr.HumanoidRootPart.Position)
            local points=path:GetWaypoints()
            --Walk to target
            for i,v in pairs(points) do
                --Blocked
                local isBlocked=false
                path.Blocked:Connect(function()
                    isBlocked=true
                end)
                if isBlocked==true then
                    return
                end
                --Jump
                if v.Action==Enum.PathWaypointAction.Jump  then
                    Humanoid.Jump=true
                end
                --Move to Next position
                Humanoid:MoveTo(v.Position)
                if NearestPlr~=nil and NearestPlr:findFirstChild("HumanoidRootPart") and (points[#points-1].Position-NearestPlr.HumanoidRootPart.Position).magnitude>=4 then
                    if points[i+1] then
                        Humanoid:MoveTo(points[i+1].Position)
                    else
                        Humanoid:MoveTo(NearestLoc)
                    end
                    return
                end
                Humanoid.MoveToFinished:Wait()
            end
        end
    end
end
while wait() do
    DoZombStuff()
end