NANO SHUTDOWN_REQ pin Functionality

Per JETSON NANO | PRODUCT DESIGN GUIDE | 20190607 documentation (see highlighted portion of image below), it is stated that the SHUTDOWN_REQ* pin can be the result of “temperature, voltage, SW, or etc” events. Is there a list somewhere of the possible events/triggers? Trying to find more specifics on the pin, especially the “etc” portion of the statement.
We are trying to resolve a SHUTDOWN_REQ* event that doesn’t seem to correspond to temperature or voltage. It is possible it is due to SW or “etc” event, but unsure of all the “etc” events (ie timer or other) that may be trigger the shutdown request from the NANO.
All help is appreciated,

Greg