I'm having problems getting Build plate to go low enough when setting Home. It used to go down, come back up and then down slowly and stop low enough that I could then secure the build plate so is touching the bottom of the Vat. It now comes back up too far and stays there.

What it used to do, was go down fairly quickly, then sensor is reached, with a beep, it goes back a bit, then down more slowly and beeps again at the right level. But it no longer goes back down again, it stays at mid-up. Software fault ?