I watched a movie over 15 years ago.
One man rents an apartment, he was very friendly, but then it’s like he is not responsive. The owner (main character) gets very nervous because I think the tenant was not paying the rent.
The tenant gets more and more not responsive. Eventually he disappears robbing everything inside the apartment.
The landlord learns from somebody else that there are people doing that and he has to let go, but he insists and tries to find him (I don’t remember if he finally does)
I think the tenant was Bill Murray, but I couldn’t find the movie checking his filmography.