Check the spinner, it activates the maginet. I was getting inconsistent magnet activations so I adjusted the wire form. Check the spinner switch for continuity.
Also my switch in back needed to be adjusted to register DTR. checked by manually passing a ball through.
Make sure you have the current rom chip as well. I think there is a corrections to the magnet hold during DTR.
Mine didn’t register DTR for a long time, until I troubleshooted it. It is satisfying to see the light show when you do.
Good luck!