1) I do not believe the device stores any logs, mainly because of storage limitations
2) The hardware reset is outlined in the user manual:
Reset: hold B2 while starting the controller, until you see the Reset screen. Select yes and then hold B3, a hardware reset will be triggered, and the controller will recover to default settings.
3) Using my mobile app you can export and import your configuration. This backs up everything except the HTTP port and device password (prevent setting them to something you don’t know).
4) I have never heard of this nor experienced this however I suppose anything can happen.