I have replaced the battery with a fresh CR2032, removed the dimmer switch from Homey and Philips HUE App and unplugged the power for a few seconds from the HUE bridge. After that the Philips HUE app was unable to find the dimmer switch which has been resolved by pressing the small reset gap in the battery compartment for about 10 seconds. After that I was able to add the dimmer to the Philips HUE App and link it back to the bed night HUE light. After that I added the HUE Dimmer in Homey (using the official AtHomey version) as Philips HUE Dimmer V2. The battery is showing 100% and I think time will tell if this resolved the problem. Thank you all for your replies and your help.
Edit: the messages in the timeline stopped. Above resolved the issue
