Rust servers stall from time to time due to AI - the console stays open and it does not shut down, stays on the server browser, but players cannot connect and RCON wouldn’t work. There are a few options to check first of all.
You may consider killing all NPCs with a plugin or commands which could get rid of the “buggy” ones - worth trying once.
You can disable the movement entirely by setting
nav_disable 1 in
server.cfg or as one of your startup arguments.
If you have just wiped recently, it could be better to just change the map as soon as possible - in most cases the NPCs are just stuck on certain maps and/or their areas, and therefore changing the seed would fix it.