I'm having a similiar issue, trying to dock 2 ships in munar orbit with a magnet, I go eva & take magnet (& connector with it) but after about 5 seconds the connector breaks off & is dropped 5km behind the ships, also trying without connector, the magnet stays yellow, cant connect. Restarted game several times, doesnt work. Difference between ships is 30m, not changing, not rotating.