We have been having this frustrating issue with our magnet, but seem to have found the solution / culprit.
Raise the playfield, and rotate the magnet (ours was loose, had slipped and was also not snug against the pf)
The first attempt at rotating the magnet didn’t help, but rotating it a second time, further, so the white label on the rear of the magnet is at the bottom/6’oclock seems to have solved it.
The magnet now grabs the ball out of the orb every time.
We have held the magnet in this orientation with gaffer tape for piece of mind.
Hope this helps!