I have just gotten a FLSUN big delta printer. It printed a few times, then I had trouble getting the temperature to drop on the plate, and it started acting weird. Now we cannot connect via USB, and the control screen works only somewhat. It won't respond to multiple presses of the down button, only responds if we make it go up first.
It doesn't seem like anything is physically broken. But definitely with the USB not connecting anymore there's something wrong.
What do you think?