I'm with IDWT on replacing the mag switch.
Have you seen it happen in the down direction?
Your're not slowing when opening the slowdown switch, but no 052 faults?
If you've only seen it in the up, maybe you're blowing through the floors in leveling. Check the up level adjuster for junk in the screen.
Maybe I'm reading your post wrong, but the 1-A uses mag switches and vanes for LU/DZ/LD, not magnets and switches.

Anyway, good luck