Hi @juan_martin2 welcome to the community!
It appears that the mongod received a terminate signal, and duly obeyed by killing itself. In that end, the mongod is behaving as expected, and correctly.
Unfortunately beyond that knowledge, we have no other hints as to what sends this signal, and why.
You may be able to know more by maybe looking at the logs of other apps you have? Perhaps you can find the culprit by selectively turning on your apps, and check at what point the mongod process shuts down? This way you can narrow down the possibilities.
Best regards
Kevin