Device unreachable after restart

Hello all,

When I restart my installation one of my device become unreachable :

It’s a Siegenia Smart handle (matter compatible) (battery powered) .

On my installation I have Sonoff and Eltako devices (at the origin I had also Eve also but I removed them because they are unstable)

Does anyone have a fix ?

I am running a thread network using Sonoff ZBDongle firmware 2.4.1.0 (460800).

EDIT : I can see it back but only after 5 minutes minimum. (clock in hand).