So I recently checked my profile and saw that my bootcount went from 14 boots (1,3%) to 15 boots (1,4%).
I failed to find which game I got booted from in the "Past Games" tab. I couldn't find it after sorting them by "Ended Date" and scrolling through hundreds of games. Even searching with the search tool (Control + F) searching for "boot" I couldn't find it anywhere.
I didn't report it as bug as I am not sure whether I encountered one or not.

Anyone can help me there?

Hmm, maybe a teamgame in which you were booted and then took back from AI? It counts too. And you won't find it in past games easily.

Yes! That was the problem! Just found it. Thanks for the quick response.