After the upgrade to 13.3.1, the battery life of my iPhone 11 Pro was normal again - at lest for a few days. Suddenly, I'm now there again, where I was before. As you can see on the screenshot, it started to consume just like that.
This is now going on for more than a week. I've disabled the iCloud sync of my address book, but it did not change anything.
I've noticed then, that Siri showed up in the battery usage, even I'm not using Siri at all. I've enabled then the iCloud sync of the address book again and disabled all the Siri setting: Siri iCloud sync, all Siri settings including all the applications and dictation. But this did not change anything. Battery usage did not got any better and interestingly, Siri is still showing up in the battery usage. Rebooting the phone did help.
I am now really running out of ideas. When I called Apple two months ago, they suggested me to factory reset my phone and not to restore from any backup. Just login into my iCloud account.