Keyboard on Macbook pro , early 2015 with MacOS Monterey 12.0.1

Since tonight suddenly my keyboard acts strange. Looks like something is activated after pressing a wrong button. For example I cannot type letters or numbers, and when pressing a key (letters / numbers) the screen flashes. When closing the lid of the macbook and opening it all works normal.

I've allready cleaned the keyboard properly but cannot find the key or thing that locks the keyboard.

Is it the trackpad that hangs or causes troubles?

Also when i want to navigate to system preferences nothing happens when i want to move back after

In word I cannot navigate too menu bar, when i click with the mouse than nothing happens.....

Diagnostic control doesn't tell me more...

Who knows?