Yeelight LED colour stuck on 25% during setup

I have had 5 bulbs working perfectly up until a few weeks ago.

They all seemed “offline” in the yeelight and the mi home apps.

I tried to reconnect them as I have done in the past countless times but during setup the landing stops at 25% and then fails.

These are all my main lights in my house so it’s become a massive inconvenience not being able to use the.

Any ideas of how to resolve my issue?