journalctl as root. Something has happened atleast, maybe. Today i did use diptoh whole day without issues. The gpio-expander is tricky, as it looses its config if it looses power. I had to add some paper (2 layers of 80g) under the pcb (between 3dprint and pcb) for reliable contact. (<< dirkvl FYI) If fails, just lift the toh few mm from the bottom left corner, to make the microswitch toggle.