So it happened again!
I was waiting for an important call, but by some effing reason my units were set on focus mode. Thanks for that! 
I have one focus mode, and that is sleep. From 2035 to 0600 no one can reach me, which is good and all I need.
I have turned off the “smart activation” or what’s it called in english.
I don’t understand why it has been turned on now!?
Is there any way I can see why this has been turned on?
//frustrated
I have the same problem. Curious to know if there’s any fix. It’s kind of annoying not to be able to rely on my Focus modes.
Is there anything enabled like this?
https://www.macrumors.com/how-to/schedule-focus-modes/
Have this Focus turn on automatically at a set time, location, or while using a certain app.
If not:
One user there posted this possible fix.
Allegedly “Apple Support” has told another user:
I spoke to the folks at Apple support today and they confirmed that this is a known issue and it should be fixed in the next big update coming out in the next week or so.
(There is nothing to be found about this issue in the release notes of the current 17.1 beta.)

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It jjust happened again. Now I saw that the iPhone was in Focus mode, so I could turn it off. But I can’t see why it turned it on, and I don’t remember seeing it last night.
No schedules, no smart activation. If there only was a way to see what activated it…
Just checking, and I’m sure this is covered, when you say scheduled does that also extend to automations?
You can set your focus mode based on, for example, a location within the automations workflow (Shortcuts → Automation).
Thanks Chris,
I have some automations that are related to HomeKit, and turning lamps on and off (that’s how advanced I am
).
I have looked at them now, and can’t find anything about focus modes.
Besides, if that would be the case, then focus mode would be turned on every day. Now it’s intermittent (and because of that I’m not aware when it happens and that is quite annoying).
I was sure that it had to do with the “Smart activation” thing, but it certainly is turned off everywhere.