What should I do if the floor in my room near the balcony shakes regularly?

It should be some factory or construction around your house that caused the house to resonate, I used to see the same situation on TV, go and observe the surroundings of your house

resonance.

The vibration frequency of your room near the balcony and the vibration of a large mechanical construction work in your house coincides, so it resonates.

On the side of the room, within a radius of 500 meters, look for the source of vibration, if it is temporary, such as a construction site, then only patience until the construction is completed; If the large machinery of the factory vibrates, then you have to negotiate with them, so that the factory can take shockproof and shock-absorbing measures, and the earthquake-proof ditch and earthquake-proof wall are more realistic and effective.

With your home as the center of the circle, a radius of 1 kilometer, look for factories that use large-scale impact equipment in this range, such as foundries, mold factories, sheet metal factories and other metal processing factories, what equipment manufacturing factories should also go to see, of course, stone factories, large wood factories should also go to see.

Let's find out again, upstairs in your house, does anyone use what equipment to process anything at home? For example, small printing presses, meat grinders, food grinders, dough mixers, etc.?

I've seen a class on TV before, yes, it's caused by the mechanical regularity of the neighborhood of the factory. The band that happened to be shaking was in this location, or you could also take a look.

I've watched a similar program where experts have been looking at it for a long time and looking for the cause in a factory far away, and it seems to be causing a resonance.

It could be a shock that left behind a suspicion, or it could be a problem in your home.