Hardware LAN play not always working

[MADEiN83]

Hi guys!

I've a question about Switch & LAN play (not online).

I've three Nintendo Switch with:
- same CFW (v9.2.0)
- same SXOS (v2.9.4) + Stealth
- same WIFI network
- same games & versions

I want to LAN playing and one of my Switch doesn't always to connect (sometime I can connect this Switch without problem).

I tried with following games:
- Animal Crossing New Horizons (v1.1.1)
- Dragon Quest Builder 2

Sometimes, I can connect my three Switch in the same time (A + B + C).
But sometimes, I can't connect the Switch C to A or B and A or B can't connect to C...

The error on the Switch C is: 'A Communication Error Occurred.' - without error code...
Switch A and B never had a connection error.

Have you ever had this problem before?
How do you solve it?

Thansk a lot!