Time-based Homekit automations completely broken on iOS16

My experience with an AppleTV and a pair of original Homepods is worth mentioning. I usually connect the ATV with ethernet cable. After changing the wifi router I had unreliable Homekit performance. I found that disconnecting ethernet and connecting the ATV by wifi fixed the problems. I also found that, later, I could reconnect the ethernet cable and Homekit remained stable.

Another issue I came across was that I sometimes need to restart the ATV after a software upgrade.

I realise these tweaks will likely not address the problems raised in this discussion but they point to quirky performance of Homekit.

See also this discussion:

Homekit Automations are broken in iOS 16 - Apple Community

Unfortunately there doesn't seem to be a viable solution. Homekit behaves like there are intermittent hiccups in the system - like it is out of action (wifi?) when some events are supposed to happen (such as turning lights on or off) or maybe there is an issue with it knowing the time of day?

I’m having issues with automation not working as well with ios16. But its hit and miss, some of my automations will work and some won’t. I can turn things on off ok in homekit, or if I test automation it works, but just not triggering itself automatically for some reason, and it was working everyday with no issues.

Mine are being whacky too since iOS 16. I have three lights set to turn on automatically at sunset and turn off at 2 am. Sometimes they turn on but it never turns them off. Sometimes they don't turn on at all. Sometimes just one of them does.

I was having issues, and my hub is AppleTV, so I unplugged it and plugged it back in to power cycle. It seem to help. The automations that were not working are working now, but I’m still watching to see if Ariana nation is working.