Stuff keeps falling in my apartment. I have pictures of my kids on the wall n the other night i heard a loud noise. It…

Stuff keeps falling in my apartment. I have pictures of my kids on the wall n the other night i heard a loud noise. It was the pictures. They fell. I didnt think anything of it...maybe they just came off the nail. Even tho they have been hanging for weeks. And then today i heard another noise but couldnt find what made it. A few hours later i noticed 2 picture frames i had on my end table had fallen on the floor. And they were in the middle of the table...not on the edge. No one else was home. I have no pets. 🙈🙈