Smoke detector just beeps, but space-dependent?

Just scared me to death.

I lie on the couch and watch Netflix and suddenly the smoke alarm starts beeping in the hallway.
No smoke, no nothing nearby.
Battery out, battery in - beeps again.
Battery out.

Now I go into the back room of the apartment with the smoke detector, insert the battery again and?
Nothing!
I walk towards the hall and exactly at the threshold where the hall begins (i.e. From the baseboard) it beeps again.
I repeat the whole thing 3 times.
The third time it finally stops beeping.

What did the smoke detector react to?
Neither boiled / grilled / roasted, smoked (non-smoking household) or anything else that could produce steam or smoke.
And why only in the hallway and not in the directly adjacent rooms?

Maybe coincidence?

Yes, that was my first thought… Or something about the battery.
But that doesn't explain why he then beeped ONLY 2 more times in the hallway and in no other room.
I walked with the part through the apartment and the whistling always started exactly in the hallway.
The thing does not know in which room I'm right now?!

Battery empty? Maybe some dust or a mosquito has come in.

But that doesn't explain why he then beeped ONLY 2 more times in the hallway and in no other room.

This is exactly a coincidence.

No, it would be a coincidence if this ever happened ^^

I've had it before, changed the battery and the problem was solved.

Well then he deliberately beeps in the hallway.

With you, it only beeped in a certain room, so whenever you enter this room with the fire alarm, it will beep.
Do you leave the room, it no longer beeps, do you come back into the room, do it beep again?

The batteries are new, by the way.
The smoke alarm was serviced about 5 weeks ago.

Maybe the RM is also defective.

I believe it too.
There are demons at work.

No, actually I wanted to know whether there are invisible gases etc. To which the smoke detector could react or MUST smoke be visible?
It may be that a gas has been released in the hallway, which logically is not in the other rooms.

He wants to annoy you and rob your mind 😃

He did it.
At least he's shut up now.

How old is the battery? Does it have to be changed?

About 6 weeks.
He was serviced 5 weeks ago.

The thing works with a photocell and if it doesn't get enough light it thinks it's smoke and beeps. Look carefully if the mirror in there's maybe cloudy or dusty. Then clean carefully.

Could be the battery. Simply change the smoke detector with another, you surely have several in the apartment that you can exchange.