My ai randomly freeze

I’m new to unreal, but I have built an ai that follows your player around but they will stop moving completely sometimes and I have no idea why
BT


BB

AI Controller

Movement code in map blueprint

Can’t edit for some reason however it seems they freeze when I go somewhere they can’t like doublejump somewhere high or when they touch me, is this something to do with the on succeed/on fail nodes? I can’t work it out