Smart bulbs not responding with HomePod devices despite troubleshooting steps

Homepod devices not responding. Hi, Im hoping someone somewhere can point me in the right direction to my issue.

One morning I awoke to a message telling there was no internet connection, this seemed to have happened overnight but was back up and running by the morning. An update on the router perhaps?

everything was working and connected except....

none of my previously working smart bulbs on the home app would respond.

things I have tried.

1, resetting the router - no change

2, resetting the HomePod mini - no change

3, updating the HomePod mini - no change

4, turning off and on each device - no change

5, trying to re pair a device - would not pair

6, Updated to the latest IOS

the 3rd party app that came with the bulbs shows 3 of the 4 bulbs and works perfectly.

next steps

is there anything I can do before removing devices and trying to rejoin? will doing a factory reset on the HomePod help? as anyone encountered this personally?

its completely bizarre that everything worked and overnight _its all died... It's like they are there but the HomePod can't connect to them.

any help would be much appreciated.

Andy

[Re-Titled by Moderator]

Original Title: Smart bulbs not responding