Why does my animation stop randomly?

I have a loop of animations playing in a NPC with an animation controller, and it plays perfectly fine. Unless you get next to another player, that is. They only stop playing for me too, which is even more annoying. Filtering enabled is not on, so I'm not really sure why it'd do that..

while wait() do
        if attacking == true then
            if combo == 0 then
                combo = 1
                local animTrack = stand.AnimationController:LoadAnimation(punch1)
                animTrack:Play()
                wait(0.2)
            elseif combo == 1 then
                combo = 2
                local animTrack = stand.AnimationController:LoadAnimation(punch2)
                animTrack:Play()
                wait(0.2)
            elseif combo == 2 then
                combo = 0
                local animTrack = stand.AnimationController:LoadAnimation(punch3)
                animTrack:Play()
                wait(0.4)
            end
        end
    end