All my devices offline

Hi everyone,

all my devices turned offline yesterday evening (exept for yeelight ledstrip).
I have 3 yeelight color v2 and one v1.

I don’t really understand the problem, the bulbs seems trying to connect to my router: they appear and desappear some seconds after.

From what I can see from my router settings, the IP has changed, I don’t realy understand why.

If I try to reinitialize them, I found the bulbs in the Yellight app, all goes well until 50% then the pairing process slows a bit until 100% and then it fails “connection timed out”.

Is anybody aware of what it’s hapenning here ?