Dont know if the mine issue is figured out, but I think Ive managed to narrow it down to one specific case:
when you dial between a milky wat SG and a Pegasus one, if you, close the connection and then remove the milky way one, you get a landmine.
Ive tred several combinations of actions, but I only get this error in those conditions, closing a conection between pegasus and milky way SG's, and then removing the milky way one