Wifi is starting from its own

I have a probllem with my wifi.

In the battery tab I often see that the wifi is switched on (or ist not switched off).

As you can see in the picture, the wifi is switched on around midnigt. I did switch to flight mode at 23.00.

The wifi signal was activated shortly after this.

Does anybody knows, how to find out, what causes this? Is there an app (logcat, etc) to find out why?
Thanks

For information only: flight mode does not prevent wifi. Flight mode switched on will switch wifi to off, but wifi can be switched to on and will work despite flight mode = on.

Ok, for clarification: Wifi was also switched off manually.

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