yup, i gave up on the maintenance ships, sent them to the system i have colonies in and emptied them out, theyre going to the breakers next.
I built tugs and sent a couple each to the systems where the SS's are, and when the maintenance get close to extended they run aounf the system and tow the SS's back to the colony where they do the overhauls. then they get towed back into position.
Since i put five of them in the problem system with the aliens popping out of nowhere, havent had any sightings. Started putting SS's in the next system down-chain and one showed up next to the LCrusRon and promply turned into dust bunnies. Still waziting for the salvage vessels to bring it back to the home system. Alien tech, yums.