Event id 540 and 538 within seconds of each other for only two of the pcs on my domain

In my event viewer on one off my servers i get event id 540 and 538 over and over again within seconds of each other but only on two of the machines in my domain. it happens no matter who is logged into that machine or not and nothing is running when this occurs as far as i know. we even have an instance were we will get this event during the weekend even when the wharehouse is closed and it logs it with in seconds of each other over and over again for the user last logged into that pc. but there is no one here to even be using the pc, and on top of that every pc is logged off during the weekend. if anyone has any ideas please let me know. Changing auditing settings is not an option i just need to find out what is causing this on these two computers.