Hello @VincentBlic,
Before considering a reset or firmware update, could you please try executing the following command:
rm /usr/share/vuci/menu.d/menu.json
Then, reboot the router (reboot) to check if makes any change logging to WebUI.
Additionally, you can try restarting the HTTP server service by running:
/etc/init.d/uhttpd restart
If the issue persists, please check the HTTP server service status with:
/etc/init.d/uhttpd status
Let me know if this improves the situation or if further assistance is needed.
Best regards,