https://github.com/home-assistant/home-assistant/pull/13109
Only now do I realize this is explicitly introduced and thus intended behavior…
have had issues with this ever since.
I had a few links for reference lined up: Any hope to get hue.hue_activate_scene back?
Btw, I thought to have it solved, (by disabling the CC hue.py and killing all my python scripts listening to the lights). It isnt though , lights are still showing unavailable at irregular and often times.
Unfortunately it is still very unstable.
We might want to raise the issue again on the Github… This newly introduced Catch should mark lights unavailable when the hub is, but as I can safely report, this happens even when the Hub is available just fine. Got 3 device_trackers to prove that 
