Every time I run servo_zeroing.py the shell blocks after servo 11 and I have to start it new (either completely or by using Strg C). To me it seems like all the servos are zeroing properly or at least all of them move till a point that seems aligned. But still the shell blocks afterwards. (It doesn’t throw an error but it does nothing afterwards).
Had anyone of you the same problem or knows how to fix it?
I would be really happy if one of you could help 
Not sure that I’ve 100% understood, but ctrl-c is the normal way to quit most Sunfounder robot-hat centric programs, so I don’t think you have anything amiss.
That’s correct.
After running the servo_zeroing.py script, the P0-P11 pins will return to their zero positions. Simply connect your servos to any of the P0-P11 pins, and they will automatically return to the zero position.
Please note: this script runs in a loop. You will need to manually stop it for the process to end.
Press Ctrl + C to stop and terminate the script.