Thx again for the great work
I've noticed two more issues:
1) If your program is switched on and you accidentally press and hold the joystick (inwards), the program becomes unresponsive, you cannot exit the program or go to a new page. The only solution is to restart the device. This happen to me a lot, since in my bag the device gets pressed against other objects.
2) If you write stuff at the bottom of the page (1-2 cm), this won't appear in Xournal so one has to avoid writing on the bottom of the page