Ced2ric wrote

I suspect that they are roaming from one AP to another one or to the 5ghz band that might cause these disconnect.

Could be, but then this means that you have just too much EAPs on a too small area, so their WiFi cells are overlapping.

How big is your house (length × width)?

Is there a way to track or graph these movement between AP ?

 

No, there is no such function in Omada controller as far as I know.

Ced2ric wrote

Hi house has 15m large and 10 m depth per floor. 2 floor and an atic.

 

Each antenna's are using a separate channel on both the 2.4 and the 5ghz spectrum.

In my opinion it's overkill to use 4 EAPs on such a small area, except your walls and ceilings are made out of reinforced concrete (ferroconcrete). If you use a common SSID on all 4 EAPs, try to reduce Tx power to avoid disconnects caused by (basic) roaming.